Malicious PDF — malware analysis report

Static analysis result for SHA-256 012cfb2f6caf95a8…

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 13:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eb779b83883274ba4ec4277a1f207b8 SHA-1: 8d03ab94c60606a972709a5c41cc8b619194f5a0 SHA-256: 012cfb2f6caf95a88431e12a2028cffea91be4f9e7cfe423934b471e3c2a3a5b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://homeopathyhongkong.org/files/gunukegi.pdf In PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/69304547898.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d450ecae7dc79f32773561c6011fec84/16844515296.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/bolalonirudokisuv.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/59068710548.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8gbnoijvmsca71r685s5t2gl72/38178515044.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780e3b4c403---94054163115.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/kanig.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/biwijojadugogipare.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb029063b---sipetetasunesudopebebumom.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/42452768161.pdfIn PDF document text
    • http://cy2hand.com/userfiles/jumidivixererigudol.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/rapirakedavut.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/jebazatugeradinovet.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-14/20210714092833453430.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wuwevebo.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/41843316671.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c0ab59a5---19561831594.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/fozapakuze.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/3f95abff83e40f4551a248ca43b76160/56270877336.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0ou5jb3cdvp9dd2rqghr3tr1u6/reninoxudexusoteridakij.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/powajukatetosuvokokom.pdfIn PDF document text
    • https://norservis.com/files/files/zamemuva.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qkg4g7ogbubkb92cf89kon6s9j/zejisivadofekeledafe.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/dojuzufagugevevagatixufoj.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4b74ec272ec8ae021e4164df0a864ed0/12200845372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=strength+and+conditioning+for+rugbyPDF 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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 10972 bytes
SHA-256: c6295328e9b0f0b4b0eb2639239ff835cf9e7bb603378d1673b5aca664ba9550
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 16652 bytes
SHA-256: bbec619048795d88586f9d960e0ecc8b6d9dcda917a1ad091650575510185bb1
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1