Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad38efb0cb35c91…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 13:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d27fe3a97c4520b61c34b45d56489c4 SHA-1: 2605de38e44a2533e6b48a55467640585be8fc58 SHA-256: 6ad38efb0cb35c9122f76c8139a8a453bfde3c3a7f6e851be87e361f7258d229
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Heuristics indicate the document impersonates USPS to lure users with a fake change of address form, directing them to external links hosted on compromised or suspicious domains. The presence of multiple links and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+usps+change+of+address+form+pdf.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lawweb.info/mycms/admin/userfiles/file/duzilasagej.pdf In PDF document text
    • http://bhs1966maui.com/clients/64750/File/89255824578.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f78cc5ae8b---62664160469.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/39778936952.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/78565402871.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbdc65c4c0---zozopigodozonogekeraga.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2613e4472---63173882574.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072896d0e453---43325509976.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe41f2e26---nasisibiriberadunamid.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/48312783453.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/konozugorolunazo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/vitunomafu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f2014e6f---67122201989.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/42824814657.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/pekewuxepirizivem.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7941cfe76503eaf698686038e0236afa/96910549366.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efebdfdbd14---5620084669.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/keseseletaregimididaka.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052202161870554.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/58491897899.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/maneloboruw.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae978c63e---84634857813.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/feremizoga.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/xonepejimapekojuwakel.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pixugodoxebozin.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/tikazanujutipolimetefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+usps+change+of+address+form+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 17228 bytes
SHA-256: f67b79d3abee072b8088409372884dc439ac464475e130971c402f31104929bd
font_01_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 10908 bytes
SHA-256: 5251bbb033c8af7449ef21ca557d17a733dc7f2a92a1ccb16d35419a14919562

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