Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61825cb43a4269c…

MALICIOUS

PDF

91.6 KB Created: 2021-07-06 18:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df3dc2901014165b66cc8cbda7d6985b SHA-1: 8c7e19fefc7a217ad0f3d3650ff0a66b760a9855 SHA-256: a61825cb43a4269c36c5c04ed61aace75c71258edc67a83521e942a0ba3c4ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms pointing to compromised WordPress sites, indicating a likely attempt at SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5843d26db1---72807132084.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b2aaacc8---34313526278.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b734d001e19152e667c5d75a30632ad2/22108247592.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/du4d49au012hmtapd1lnfletvm/tesasotomujefari.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c97864a02---21268051789.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a4833c8e8d5362abe0aec4163afbe0e9/rogerapewufekorir.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61ffde1bbe---8790395603.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a039ad7cff---purafiwobalaraduvos.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632c88a35a---29701421347.pdf
    • http://tecsun-moscow.ru/docs/file/48297983651.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070976346901---44987036505.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088f98718dce---jogunadibizuwoninu.pdf
    • http://udmvdpo.ru/images/files/xokijake.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe0fe0eae---84015464295.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28b0eee54f---nutiwadabisetiluz.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8aa80653b---18756508769.pdf
    • http://czapla-dachy.pl/public/images/fck/file/47091944426.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/85d9c0be9f49932e9ccfcfc1c42647e4/88446419731.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607927a2d994e---80923475289.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d1c4d1b01b90cd70fbfac454cbafee00/nodetegugupujijiruz.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84277282e7---dijuvirebiwuwomosefepeguj.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rj8o81m8qn2ej18ecfvb92u5v6/kopuwuzebo.pdf
    • https://tonwen.org/userfiles/file/26514032857.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jv5snc5lhsusengg6sl3c8lkd7/65704606342.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=short+note+on+stream+of+consciousness
    • 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_off00010225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 16792 bytes
font_01_sfnt_off00011a37.bin
01afbbe872f1aa743da7ee6505e0132b0fe464b37698ac35facd2a64cf7cc6f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 17936 bytes
font_02_sfnt_off00014875.bin
24ea9c2c003367efe4e6c00ab857813f17eb1c72c3b6cd862ed72df2a4c815cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14875 10732 bytes