Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10ec4b4f77809b2…

MALICIOUS

PDF

88.0 KB Created: 2021-07-24 10:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9a8924fb53782ea50dd94562b65f5dee SHA-1: 8d06008aac1beb30a5eb86201c0464a177f27817 SHA-256: a10ec4b4f77809b2570f56331013940e64e6bc0fea16d44cc6036ad2520db1f2
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nhs1980alumni.com/clients/878257/File/xosiwarevibanavapakovo.pdf In PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/bikonan.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/50827375175.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e399d36e---kuwivekewinekukabopubux.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f5b715ef---64803675737.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/vifuloxuzoselumerulenut.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160deedb74c14b---lafewalenozapunumexuromo.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/xawazog.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c035f7a358448e5e207081539e98beb8/57415213664.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719091dd217---dakeguf.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/9qnfvr19upmotcpaussc7npfvg/24618119891.pdfIn PDF document text
    • http://asustainable.com/global/file/38524879781.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/foxokisamagamumegosul.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/18200419256.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607576d6aabbd---17144917206.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/96285756723.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960434ce261---61316180837.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/6441464361.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd97af3094---vorifid.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5498a32161386967dc1da083571d21f4/51130548309.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe216ae2d9dfb89132784308cf4f573e/70966812885.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3646af593---vegixa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fb1ab049a53ab6009579fb62880ee204/44918062781.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e6cfb3b51d7898d8f8ac35dbbad75ea5/40579114624.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a8377b859927303f243322fe3fa7f4c9/37380365001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+prepare+for+eyelid+surgeryPDF 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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16556 bytes
SHA-256: 83f0438158f3e92121ae2a37a92eb9784f3baf13b4bd2a36c3cef2672e7c21fe
font_01_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 10860 bytes
SHA-256: a2c142c08f96c016d54e6f6a2c2abda8f9b2384cff591afb8f5e7d8f8c692396
font_02_sfnt_off000138fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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