Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e51e7de9a95bda…

MALICIOUS

PDF

102.1 KB Created: 2021-08-18 00:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9175b9f02064b9a3f2af3351e7642dbd SHA-1: 7398dd11e2523e9442b3f850106fb4b2931ba20b SHA-256: a3e51e7de9a95bda026064cad924bf635841e8dc0ac57feec38ccbf91730c00f
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The 'ML_NYX_PDF_MALICIOUS' and 'ClamAV: Pdf.Phishing.Trojan' detections strongly suggest malicious intent. The presence of 'SE_INVOICE_LURE' and 'SE_DOWNLOAD_BUTTON' heuristics indicates a phishing or scam attempt, likely aiming to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://arrayamed.com/userfiles/file/niterixanokuzusemekeri.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea651a6aa---15737225692.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210617202229.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/27150449198.pdfIn PDF document text
    • http://halaljones.com/uploads/files/gupolijeso.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5786fecbe3ef8d10690e338573e98724/bigenaz.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/xewizojarujazogagexiluf.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/54708356974.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3830594b7---pavozuzulezogilupa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83f0a1a9a---77781518848.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1df1076ee46ad5c9e43ac808f7fb7648/55006720877.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/rofogejutidiwabuj.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/38396894038.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/11406173630.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/fukavulosesij.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/49991171359.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0e407db6---jajowigozuvovafawe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ecea1ebb---99217378738.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa2cb4d57422dbce64253df37147f6b7/susovumasekexolexufetuto.pdfIn PDF document text
    • http://w-mill.jp/images/file/15303261960.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/30668215239.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a11e904d623---rasalojidejor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+report+my+marriage+in+philippine+embassyPDF 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_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 11028 bytes
SHA-256: 2c01bd36881f1bea61d1a48d034b29dc4831279b148292a0feb41bd14fd36b7b
font_01_sfnt_off000141c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D4 17516 bytes
SHA-256: 37eb6acc18f41637d018f4e1ca3b98cd02dc0112731a3a7c337721a5dffcd016

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