Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b9e228f3768ba8…

MALICIOUS

PDF

77.6 KB Created: 2021-08-04 10:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26cc221c7c2c59475529f7cdfb939b02 SHA-1: 2f8c56169589bb1a3173a3c76f24680af60f8497 SHA-256: 27b9e228f3768ba8e04ce6b172eac80eb42c5da37923fbf52c9a78b6b5f7ee9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7380

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://aihr-iadh.org/uploads/FCK_files/file/jomadenubonitoxarifovinuz.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/mewavororovig.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/mitodaliwugagosokenegubok.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdeb71ee5---19262910860.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/899ab7e25f0d1d79affdc9ecb7314f79/66744819811.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160780ff56a578---jowegeburudex.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/78542235393.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/rinomusuwapolofi.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/94913380227.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/rerojevebokipekepi.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/nufurivokerusak.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ece5a77---gebafewepox.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160996082f32f8---57436917112.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e657fe319ae---muwonirudivibizeberiko.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/dozebasove.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078aaf847190---wejijamovewajonapewajurum.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96f543a907348773fb2a7c1bda9abba2/80526506088.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0871e28088---levekona.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/30320544224.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/15541854578.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/67392833463.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/93969302812.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dadb0556bb---nudemunapapotaw.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610261e742661---niluwolepokataruje.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/vojazizibimefuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+printable+flower+coloring+pages+for+preschoolersPDF link annotation
    • 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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 10960 bytes
SHA-256: 74df7dc41c4e2fd478a72030044693fd46e1609753de06472dcacee078d32d57
font_02_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 16380 bytes
SHA-256: 151893adba2e7b90964739a0b7bdda44dbb723c001a52bf32e0a232c22f0e8ae

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