Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d6ad5640079c92…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 17:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cb441c2e545962add882dbf04a1a3ea SHA-1: ef5c85c3531ff5878645a44b8787976f384e7a30 SHA-256: 19d6ad5640079c92e80fcd7fae9f1e3adadc27b65b6b0cfd713781332e900066
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as a link farm on disposable hosting, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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 http://sns.hu/_user/file/ropoxusowazesabubinovibop.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2a5d4479---gifimakololitoxudetoveme.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4609909f7e5d892aa32be0b5093327cf/96217815043.pdf
    • http://www.thaiboat.net/image/upload/File/gitemeribizikofuzatono.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/86ca3afc7f7f77d77e428941e2463c90/42688569435.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c277fa72efce1d27a54bc891856d1444/67803160613.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096d2daa895f---29920811628.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24949ad66---64664932923.pdf
    • https://travelstore.tn/userfiles/file/nodibunuletu.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7594330c43---wugakovuwujabifof.pdf
    • http://arabic.cz/ckfinder/userfiles/files/muwiza.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5001868fc---69542628483.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/da91d244b4c94d39173d901023e8ff06/rarofagawufatumeludiwe.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb602b5158---66066030503.pdf
    • http://vistobrasil.net/uploads/file/buduranezogow.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e954be9d1---fuledafoza.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3vm9crmdg9hl3hrhvt5qu01p95/renutefipuzusarupesak.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/d2l3369lv6hmj6vu535guededt/98381213407.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ef84044e26ba13bf1539f040d7efce60/manonowebubatavana.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qu57bsukc5daqftafl5fioujl3/doxetovumizoki.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca74649528---73842234775.pdf
    • http://fouladsazanco.com/Upload/file/zubabi.pdf
    • http://spc1991.com/ckfinder/userfiles/files/64113307937.pdf
    • http://eotp.info/sites/default/files/fck/file/86435620024.pdf
    • https://littlelightnepal.org/userfiles/file/xibawofukazosekirigal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=clear+mucus+from+anus
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f3.bin
323216e138a441a17a820c1f81702e018b2e442dc54c7567309a7ce3546f5cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 10440 bytes
font_01_sfnt_off00010ba3.bin
a18f70e078532bcecc84bb54f506d27db78a7c8fa658afb54807715d5913ff79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 17720 bytes
font_02_sfnt_off000138d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 16792 bytes

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