Malicious PDF — malware analysis report

Static analysis result for SHA-256 566f624632f9d2d2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 14:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a62f527d7737473239c93704d9984458 SHA-1: e76350b0ffb8e41d4fc78485060a26dc2d06c1b7 SHA-256: 566f624632f9d2d28fb8364404fc1b397ea96e1835383a9749c58299f7fc8b69
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating a phishing and payment redirection lure. The embedded JavaScript stream and numerous external links, many hosted on compromised or disposable domains, suggest an attempt to redirect users to fraudulent payment or banking information collection sites. The ClamAV detection further corroborates the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/nuxirijekilono.pdf In PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916193006.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1e0edbd24d3f14a90eb6e8da33fb44b7/20025272981.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///42130874159.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/60292104353.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tomawumefusakelaxopi.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xifarokevi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161426629e09ad---52014124660.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904015417498131.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/39821549980.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/11061482431.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/87361483595.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/xazuf.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210903091701103.pdfIn PDF document text
    • http://abnicum.com/files/file/lisafewefirubu.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/63266594518.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/62478449779.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/46751515912.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/vowawiromevuruvibosezo.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/norewa.pdfIn PDF document text
    • http://mqskin.com/luutru/files/wuzinamakitawatitoxa.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/padafolomi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c7083647---donetawetox.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/k4i657bkgamm0v4qp173bk2jsc/lewabux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=365+family+loginPDF 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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 18896 bytes
SHA-256: 066a86e2d0db56d723506a5f0a90d5228119e9027de08fbdcf7649b6144bf9ef
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 10552 bytes
SHA-256: b2c4f07158e50a60b2045c83bc2caf00dc6f3ea4b31b3673e0e7c2e0d3afeeb3
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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