Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09168871c4fe38e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 22:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 12eed2c66e67f2f430e9ac3f6cdcf08e SHA-1: 0fb931d2293d2f8593b84de7e975276e1fd9a7e5 SHA-256: f09168871c4fe38e0187cb5683e2d77484055d2ec149a71dccb1f77ba20beca2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of ClamAV detection and ML flagging further supports its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=joker+live+stream+free+tennis PDF link annotation
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/kefazewedivapu.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zokajesezig.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090305112473.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pmes4vrbkm9fm01c5tp2q382fk/53461467185.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jotemiratikelixefon.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/rovifelosipufe.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/14420993412.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/92794905177.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/wepabifugosopa.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/sararanudix.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1620ca46---fufogosuvuzuzuxeder.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6ed3ba22fbd376d5666392cc3304c3b5/zibekewawivora.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/16877051187.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/70539315670.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/megepefew.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210918073049.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/9571682498.pdfIn PDF document text
    • http://saktigroup.in/uploads/vazidubagigisiduvuf.pdfIn PDF document text
    • http://labradory.pl/file/51776060340.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/376986548.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2ec4ff32---94454248014.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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 17360 bytes
SHA-256: 1dee6fbd5da80a5f4172192c2be2384b4281fe7fc3d8c94d0d97ff658e86790b
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 10524 bytes
SHA-256: 99cd5d95d554dfd96dbc032f2a8d886b58c206e26da0513c21dcf6eeabcd0d9a
font_02_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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