Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e91c298fcc96b9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 00:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8cad8d0c79990733f4a74b9aee04001 SHA-1: 6d540abf21c79150c5eca6b7df3c62ae598ec843 SHA-256: e2e91c298fcc96b94b9ab56a9d5eebfcf4978604bd5fb6858b5963ec00193124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aldo-ins.com/userfiles/file/maziduted.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a3de229f30ac8bd345103eb78170748d/60900737852.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/78670887600.pdfIn PDF document text
    • http://short-story.ru/upload/file/gafanalazizetawukunoxoxo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0db82a8e51---19876462302.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5e888b387780a9de49d11163a46ce680/58437994179.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/99936896906.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/19941817527.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/34041608833.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/gabexisuzofafimizab.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vukuvoke.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/40653891468.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd88d680b0---xelujofamusuxipegiwajoxu.pdfIn PDF document text
    • http://nature-revive.org/files/file/nezidogafonajufevoj.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf3bc66dd6---livawapuxajuxajuda.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210725_121254.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/85474170893.pdfIn PDF document text
    • http://rapet.hu/files/8498535403.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pidelibasezaza.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/lpuuafm639gskvsjr8na9o95u7/86735789671.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fojupufupikarejarisebeve.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/mukobamezube.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/tunubonojixura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=parasite+eve+ps1+manualPDF 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_off0000bca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 10512 bytes
SHA-256: e8f1b882affb9c05fe1bd7d57d6c9b3489b65f2d8317fef8ac8000a8170898cc
font_02_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 17372 bytes
SHA-256: 382bd0ee4d34ea731558ba533df9290a77c7780b3f15078b9a40b88cd5e579f2

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