Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3a048271790536…

MALICIOUS

PDF

95.2 KB Created: 2021-07-13 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7402ff4094bd387ea5657416bc7f1319 SHA-1: f30c6a43c7df620d419a486c1d01c37e97971d83 SHA-256: 7c3a048271790536656e1038b2eab84b84befbb86239baf136ad065a2257891d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://ofertaromania.ro/ckfinder/userfiles/files/52753134446.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1755e9c3fe0cb8c6dde9082d95467b6b/jizurelevakewimoromarusa.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cfdcc07167c04276698c894d0234645d/15161394595.pdf
    • http://nicenpos.com/userData/board/file/99222234664.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088615c6d118---tuzoxejaviworupiwevorin.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/sn9egic1g0hpuraum1cuj8d7pk/12214070287.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9841aa9989---zetutipetozinediwufa.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/74960026389.pdf
    • https://faceless.me/userfiles/files/20664280002.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089828ba7f33---rujexibalufebo.pdf
    • http://ndt-tl.ru/upload/file/tenivil.pdf
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/zosoga.pdf
    • https://lesfeesdelhetre.fr/upload/files/88069710281.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4aed00cc---loxaditu.pdf
    • http://manixcnc.com/ckupload/files/22239674556.pdf
    • http://anthonyvienna.com/sites/default/files/file/ruxinijasewaf.pdf
    • http://eksan-ltd.com/userfiles/file/vosikafetagelasofiv.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608895510b0a8---lupitiremezejop.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b6e599de---nojunutatepofov.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b239ddbde8ec342042f9454f2bb4ec66/pufepimeliwevomivixo.pdf
    • https://armagedonspedycja.pl/files/file/maweziziwe.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c39b6a1d1---pazojezezoxazejega.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/96430e0fcb8d0acf5eb68a63c41c5498/16597469330.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e819310dd---44278985715.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a851d9ee3d---wagow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=causes+of+migration+push+and+pull+factors
    • 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_off00010e8a.bin
ba8d460b472454e08798a18b10e8d78288636383e23f01f5ccbb805ce38b27c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 11200 bytes
font_01_sfnt_off00012855.bin
e22a225242ef4aa081aa1d8ac465c28bf9dc0dcfc6390155bb5a2850be2dec6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 17352 bytes
font_02_sfnt_off000155a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155A6 16792 bytes

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