Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1a8810415a8fe7…

MALICIOUS

PDF

84.8 KB Created: 2021-08-03 05:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9223735fae372a7507a16531bba1870 SHA-1: 1fc13403db7d25cb74ddc665b9787c9ae20ba97d SHA-256: 2b1a8810415a8fe75bf251c21e255c1f97e90f5fee1af829f466dce9d188b211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gerd-pollak.de/userfiles/file/56179440704.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2pn4pinhmcf46b528d2j94vu8o/nulafumesimud.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nemigidawoge.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090f596c443d---tujabebogopuzafa.pdfIn PDF document text
    • http://dejede.com/userfiles/file/50320314560.pdfIn PDF document text
    • https://esz.jp/img/editor/files/17635408886.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7af93ac1d263c1954e674d96963fee3f/likerudenuvekebe.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e0a6f73a5cb74a1b923af69480aa1f9c/zisifijaki.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1deb094be28c627a9a3f6027780161aa/53756385054.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58fcdf1703---39068768717.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/fbaa67d4c8fd7e9efb9844d5fd291079/binobatupafobogu.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/tuzegokonovidowiwulemiv.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/wazabasitirinapofu.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/jiloxefarefetasuzixeri.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/xarefu.pdfIn PDF document text
    • http://voijin.com/userfiles/files/77800733160.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/susilepi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab6c9227e4---tovimumitilem.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c019d6572bcb211e924f75c3b855f6a9/buteza.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/41532303260.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/fibegajusixa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c566250d2ab---mefigefipinuzexel.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d572b1cd770fbeb7c1a137aebca8e27a/sagefis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+close+the+uppababy+vistaPDF 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://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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 10764 bytes
SHA-256: 3fefc4452cbeaba60ad1acdab246f53b4b8f982ed5772d909b30c3129b2c163f
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 16288 bytes
SHA-256: fc8771d5f6777233b1e01384aaa3c8e8e91bfc46781b3da5f82c1a9f448652af

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