Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f02762f2cfe081…

MALICIOUS

PDF

91.5 KB Created: 2021-08-12 01:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 02eae2a80278dda704c91f09d3b57005 SHA-1: 39cc0c5392e904dab8e99cb3ee6fda7ccb5fcbd7 SHA-256: a9f02762f2cfe081b15f4d237e70c852e83f289baa471979ab58cb1bb78ec636
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several links pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The PDF itself contains garbled data, indicating it is not intended for human consumption but rather as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://syteq-pro.com/userfiles/file/46184266379.pdf In PDF document text
    • http://massvt.sk/editor_uploads/system/files/xususowexisu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/30603313079.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lle36a0trf5g43mkjcfc3iboen/58611936378.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/99797744334.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d0fdfc7b91e8ce5df2c46d4f6df530ce/gikemimopadubifa.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/niwukawajugufix.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5ab64bd766376d663e4f110425206488/95251494630.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/meliwidozi.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/78195378434.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/50827297311.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/bibikuwabexozeriw.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/93517624175.pdfIn PDF document text
    • https://agatanorek.com/files/file/guzuwulepe.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/13131985679.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/50f727db8d2d322190401b9be4d12e4e/81651431344.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210625110410_801849919.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/183136218509eeab6793ec71d4164953/43419070726.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/51536096277.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815ff1df55---dukoduluzosakejum.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8d1ltbq46s1kldufujirv12hd4/dovonunijewulenibu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbfc1bd19---46728903981.pdfIn PDF document text
    • http://geotersrl.it/file/22480042669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+types+of+bacteria+can+form+endosporesPDF 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_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 11084 bytes
SHA-256: 96b0676f41e725c0e574f1d610019cbbc5cd201736b801c275a1f762ba48134d
font_01_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 17208 bytes
SHA-256: 6a11c1794030276894df37b6a499ee8092dc1c5f488c42da6e116aaa65ace162

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