Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e66e76c7e245a88…

MALICIOUS

PDF

71.4 KB Created: 2021-05-21 04:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008a6a6cb7b1c0221d302b8e8d468612 SHA-1: bc5a2d12051f466011a4bb2be2945dec9e356f09 SHA-256: 8e66e76c7e245a880d6237942627cf2d7da51b3887b65de35aa2b47aab789af5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting 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 extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=does+chlorine+corrode+aluminum
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9103a813---69051021526.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/adb0e5s54thclefk0lkt5fmfjn/52662079354.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/14449130956.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1db2c6e9d---bagoza.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c601620f8---58467357039.pdf
    • http://asckhn.com/acskhn/userfiles/file/65944046796.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qvr8j4htam5ajc78g2quhon4l4/totugudibolas.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0aaec5a76cedf7cb81cba4dbe8346f6f/53184413112.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/10gu46p3akgp7guoo1ua57k7j2/8026387578.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/lbmlfc01k6hkh1mmnprf303si0/xuvodoj.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b69d2c2ed---xatejam.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994bf917930---gojexogikikuwonatokuj.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6080d9ab---vakebulisuw.pdf
    • http://maility.pl_adresuserfiles/file/22942250707.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160830ac366a8c---sepavafepebanir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea4.bin
ba455cd955e0d247b7a4824bbfa89f43f20e599dcec2cd3e06c941c361161802		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 4980 bytes
font_01_sfnt_off0000df4f.bin
e00a816e5556bf3c581b27fa21372da5b80b1eac63e430e8419403ab5c774cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 9780 bytes
font_02_sfnt_off000100c5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 4324 bytes

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