Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dffa228fde7d966…

MALICIOUS

PDF

77.0 KB Created: 2021-06-15 12:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c15d5827926a1ee9e300163b02f5125c SHA-1: 271162c07cfaa71123647e0232b5a3fe316e53df SHA-256: 7dffa228fde7d9665826ee8d1f448a8d66fd0c14aef39acfafe750fb4f088f54
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, indicates a pretext of providing 'rearrange sentences exercises pdf', likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=rearrange+sentences+exercises+pdf PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/18563a1ad414734a885f5ff7b41a0bd8/zibepalejonidiragufodaxi.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/81930798171.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac773b25374---63725928535.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qjat9kfpab07a2teh0prgm3s53/rizezunasedip.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zewexisuki.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/52877414857.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ug29rc9ubgg76js0aguj7gne1s/90852399951.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/q2mj3sh7eft06r32bt6bh59bl9/surabalamupenij.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/96197855379.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c4268cdad3fb569cc8b96357164216da/jukukoru.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16198671924597.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/buxibebapoxazuveg.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078053c7a0bf---wanasaxonomenutek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 5364 bytes
SHA-256: 3058b749f043e745f7e1efe839b7c1ecf23897af901b4b3e9376b5dc21faffea
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 10472 bytes
SHA-256: 91b14bde9cccd75460c68234912437bdc5d6b5a1e62651058740bb324c64af09

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