Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d91b9caa0b0139…

MALICIOUS

PDF

134.9 KB Created: 2021-07-13 16:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06d711a6195e46ed1e63e519466f38b1 SHA-1: 22ab9434fb381f7d25ce71dab23809604d850800 SHA-256: 60d91b9caa0b01398e05a731b66ca6722ca1ebfa529223a24b743d9cf73b9d22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2cnqtbp55ijrb4gio1ht1s5hde/73242615886.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/534a03db30f61f4531f5113e8e66c2d0/kebopeforuxaverujonoxepa.pdf
    • http://nadiadsa.org/userfiles/file/nugutinonepafoxekimabat.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/cp6dbvjb3ssgnpd1s794m86c00/jikex.pdf
    • http://lamachine.nl/userfiles/file/39339668103.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4f604bf9c81ca16c966c124cda4bcef7/negirugizorot.pdf
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/vuvolofu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852c850ffc9---53334191032.pdf
    • https://faltprasten12.se/anvandarbilder/70/files/15235118095.pdf
    • http://supermarketdv.ru/files/file/katosa.pdf
    • http://provia-events.de/pics/fotos/1/file/xomazibowaviru.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/ranijubud.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/24753842106.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db5bb1d38---35951157306.pdf
    • https://esperanzadeavila.com/fotos/file/zujixupuseperavobudegix.pdf
    • http://4seasonstours.in/userfiles/file/bibipugususa.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9ab2ba35c0fa0a170b927784ae34a663/3963094775.pdf
    • http://doo-san.com/userfiles/file/20210510102434.pdf
    • http://infrabud.eu/fckpliki/file/gasuvunemiwumunitojaxado.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/56048969429.pdf
    • http://fixafilm.se/userfiles/file/86975056758.pdf
    • http://abacusnancy.com/userfiles/file/33332922463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=two+variable+regression+analysis
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018fb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB4 16792 bytes
font_01_sfnt_off0001a7c5.bin
462a4783e98b38620ac8f8ecdcd5a68537a1a8a2bd0fe099007260b825b6a7dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7C5 16196 bytes
font_02_sfnt_off0001bd4d.bin
8f191131ec7993629023ab40400bb0ec59e1e523b10430e3883b4a70465bbb2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD4D 10556 bytes
font_03_sfnt_off0001d587.bin
242e45c8dcfd18a864dcc334f5b2c48cb68e315b369b4092247ca16c05b4d462
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D587 20932 bytes