Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f4174013cfc66a…

MALICIOUS

PDF

94.9 KB Created: 2021-07-25 05:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11218fe63d2cb5e9a9bfbb4574297008 SHA-1: 1c71a24c99c9f8d0dc0bec7f70f641ed43088b32 SHA-256: e7f4174013cfc66a89fc8d1018361a5961094983d5b9961b56d57c0cfc46c189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976f60055ca---61608912604.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb07940383---35927592766.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829402549d---21444008852.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6d217d4d7ed68a9b01101ccbd2f5d18f/buxapisesone.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/a10e4psfrenspmf30hkrasua4a/40514099582.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/43669581532.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/92dgi429gtsrbd7b46hhohrp03/9121310967.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/nivoterutumifabezewifus.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/62f3a8ba8a536223c9a0ba89b57759a8/86439752254.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de713150109---55126277974.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/44074606966.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/pomif.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/babusofidakajaperuj.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/badifo.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/nagawidozegokadumuf.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/1806043155.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/15a2c3323b05615559bfef4191d6fd98/gajururabogeluje.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/fuzejeka.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a8881d74ea7bc89841ce72ac562070af/81206314303.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c072cd42d4f---selibonijutinozoka.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/66601990631.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/14259676820.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a001a03edce---28751227117.pdfIn PDF document text
    • http://darec.sk/files/files/26591072854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=reciprocal+reading+strategies+worksheetsPDF 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_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 11016 bytes
SHA-256: 496a59fd46c0a6406b92181cd7b3d7bf150c8c43d60a96cb3a9f99e948092e5f
font_01_sfnt_off0001299f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 16896 bytes
SHA-256: 59d3090e9fd1c53138964aa6c5a65bb15e8585dedc0bd4585d19fba721c2fb6a
font_02_sfnt_off0001559b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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