Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a23bb8b41d3abc2…

MALICIOUS

PDF

89.8 KB Created: 2021-07-13 20:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2009565ee2c59a17fccd92109cc141a SHA-1: f8367885a5897e8576411035e5cf7520dbbbb2db SHA-256: 3a23bb8b41d3abc2a62caa91435e97dfbdada910ec55c71c8e8a1d6b742a04b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress sites, suggesting a redirection or phishing attempt. Although no scripts were directly extracted, the nature of the URLs and the detection indicate a likely attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8e49i3i48gq0tqqie1mm1hurtk/zabizenubodedax.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd30707db8---45780619403.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897ebea6661---dejudasoku.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9056glom1qr3u0fosfl8j498jc/12497220916.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8321a94e7---reredabexevowukitigij.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ef6d10be7f3116ae5e83a74391f0218c/kolejopeto.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/fidovege.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29260ca57---95695110088.pdf
    • https://baohohoanglong.com/userfiles/file/26022787023.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e605e38c2dd1156041ee09793373556f/3031133844.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c83951e3adc77e88db169e35258d5210/64650077567.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/260b6323a5008ed58ce79205ecb0f9ec/93056497552.pdf
    • http://kenshopvn.com/uploads/files/19438198885.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/suxuliziladumuluseripo.pdf
    • https://zlatartopalovic.rs//files/42488104491.pdf
    • http://olgapolyakova.com/files/files/5736898870.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/buzonokevovumobobide.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d115b50b48---zinan.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e7iemtfi1hbg308saln8rjl5sd/pajimopuzewik.pdf
    • https://angkorphotographyguide.com/userfiles/file/neref.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832c7cb3812---zefozaduviz.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836512c782d---78820443899.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+mass+number+of+element
    • 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_off0000f7b5.bin
4e6750d797d7469539c9d76c2e20b51073421f4510dafccb87777bddb3b12d82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 18800 bytes
font_01_sfnt_off000128fb.bin
4bb9c1bf296ef269107eda4508434d60e25420c54a04484523d24a0be32f5d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 10780 bytes
font_02_sfnt_off000141e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 16792 bytes