Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83ff1e2d5f05187…

MALICIOUS

PDF

91.9 KB Created: 2021-07-04 02:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c04406c303367277bbebf8f17c817405 SHA-1: bd5cf75d6dd2e9077a40f7e2fd0f9ac70fd50798 SHA-256: a83ff1e2d5f0518777d67a9971e9353315c28e66939ddf8117d3d5bec7389b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm or phishing lure designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the overall pattern indicates a phishing or malware distribution attempt.

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://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/19b26689a0fe5960638bbfddcc66308f/14989167265.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7287d2302---xejixobo.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/65529055e9140c04dc84ab3fc2a8ca8b/32571261366.pdf
    • http://smclassof57.org/clients/34860/File/nuzabiz.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/25362781530.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c4c1d4e4---busapog.pdf
    • http://alpha-th.com/userfiles/file/91195394409.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24a3bf8dd---63148223219.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/28f36367590799b497e0cd504e069c14/ronuwelupikemi.pdf
    • http://mobilesamara.com/img/files/file/73944548849.pdf
    • http://orchid-daikanyama.com/userfiles/file/72023466975.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gacl90i1sfbas7fs9uqlgre5gb/62286848781.pdf
    • https://cgeminfos.ma/upload/file/zexafo.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5138d952356fab2debc16d9bc8483969/82798804742.pdf
    • http://www.pranabkumar.com/fckimages/file/zidaxekokunizuna.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/urjhdkgvtl9a58oqr6g2evnv48/wasaberenejaxipokovebison.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a7b1f6c5---60211129396.pdf
    • http://artecgroupservices.com/imagenes/file/nazijasemanikuk.pdf
    • http://kanstm.com/ckupload/files/punenobenofewelaxeraw.pdf
    • https://iwnta.com/userfiles/file/xubutujore.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9e2ee503---fegekiwozevewezo.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3d4c97683d5340d454365c2179747556/wopipuporadokir.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/44852977575.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nordstrom+employee+manual
    • 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_off0001052d.bin
12612350e0a4d4e5151dd6b6f1a1c74a39cfbc6fe6a88323220eee85ede598ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 10652 bytes
font_01_sfnt_off00011d95.bin
060b1878f207a39cf086ca5e0d8a60e0a50ab9027fa80df4f0acd86f0be65212
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 17436 bytes
font_02_sfnt_off00014a75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A75 16792 bytes