Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f742a625d00c53…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 07:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efba902cf599bbf183390e66ed08a7cb SHA-1: ac2969c7fc0d08271bfb4b513d374f0ac5b9ed03 SHA-256: e6f742a625d00c53c17ed9d25f174b8c56e49a682b7f9e22bfb68578a3c47a4f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 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://coretry.ru/uplcv?utm_term=2009+hyundai+sonata+shop+manual PDF link annotation
    • http://myredm.ru/uploads/file/ziwed.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jvtuovuad6nc2jf6oq7git0773/zutiluvixozidid.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ae9507b43735de8a5d97fd4512a4c2f9/82276742830.pdfIn PDF document text
    • http://vo23.ru/upload/file/35024159241.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nekin.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/61978312836.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/24859278602.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/96622629000.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/13612655692.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce1de115b---3740616119.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/32060876361.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/20775554239.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2670beaf---15354614042.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/fexedogitete.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/fejulosuruleluwigiwubu.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/zanejomomuzewobetifaf.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2de710f5---9906923600.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/8515888638.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9355e370b---webexixobak.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851091d8c29---63171127668.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/2kdmm6efkb39khj8aufls24sgi/xixilokotukomofebaru.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/xukoxidezegafozapon.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1811061552---47098414616.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/penofifolegoji.pdfIn 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://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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10952 bytes
SHA-256: 8227be183eadc94ca83d72dbd3005f7264aad1963d3b124933a24c5b0383cac3
font_02_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 17440 bytes
SHA-256: f301d6a1043bfed1178f5c501d95a859af3c3f89c2ca53953bb44b31bf60a072