Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91ae698a2814871…

MALICIOUS

PDF

106.1 KB Created: 2021-06-26 11:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76fe55e2980cdf14000b7e9857ab60bc SHA-1: 2bb5461aad8320e533b4d3c87c5baa5978bfa99c SHA-256: c91ae698a28148714c999fc7cb0130eeefcae0bf1902c59188acb09917222475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and link farm suggest it's designed to lure users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612f6751b7---55960011553.pdf
    • http://wittlich-luexem.de/userfiles/file/56886636986.pdf
    • http://dermalab.pl/userfiles/file/fajexopolezufad.pdf
    • https://yuss.it/file/94418433295.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dsn6jv2l63sfqcptde5gir0ch2/sunoxo.pdf
    • http://bajcsidavidfoto.com/_user/file/tasoxogubidulovelilosino.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4mgum05k63tvcfonipvpv0hqpg/92575811642.pdf
    • http://talleresjpg.es/img/file/91009076476.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a360b5d177a107a6aec34bc6496d04cb/futepoduludexotavozodinar.pdf
    • http://eurekaelearning.com/upload/news/file/sidasefulotuvok.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f2a33007d---xikofogagefubabutu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1ce57504---dufir.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6c86a452---28073349319.pdf
    • http://www.lugashotel.com/data/editorfile/xakiraxo.pdf
    • http://parzenica-bialka.pl/userfiles/files/jisabiloravemefij.pdf
    • http://zxsolar.com/d/files/dileronikon.pdf
    • http://agnieszkapawlik.com/userfiles/file/xolalagigufefezakogogidej.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8736d1ef---70871118650.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9178dc9ea---12657537970.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432f5b3a09---nunetutekewulamo.pdf
    • http://cpgny.com/userfiles/files/dunikabovobeza.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2819a0287---75291377362.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/75gbvdm58q89752c7f6oi2echt/rigudalivadavoz.pdf
    • http://patanamachine.com/imgUpload/files/jizipajom.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf522239c0---7231464807.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=more+readily+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000167af.bin
63c74fcb7d502794733b88f9b15c493a630df5cd983429b14553304f2ae4ecd2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x167AF 30460 bytes
font_00_sfnt_off00010c78.bin
a74d43caf1fb5bb617c4e11f6775a6918db86043b788fb0526e998b6e4d6733f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 16888 bytes
font_01_sfnt_off00013845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 16792 bytes
font_02_sfnt_off0001505c.bin
efafc335615d1a0aaefe0add362178743834729d1e1d0a8f94801c67c30d0782
pdf-font-stream PDF embedded font (sfnt) at offset 0x1505C 10432 bytes