Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ec56dad7bad323…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 19:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2b83e7321c04f7b625143101ac246a0 SHA-1: 322d10bf84a5ce9896d4c53b3572786dd7ff79f5 SHA-256: f5ec56dad7bad32309312f7698903f9482845597eca54e72c395999e0df10836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with common techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8c08dab81a4bbebb62a779f035f6ceef/wijukozote.pdf In PDF document text
    • https://watertorens.nluserfiles/file/60826073889.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/48954490783.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab9032663---vexazivorufukafibeb.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/garinogas.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9ss5djfcqlvnh6hp8mhjjnbk17/89233484110.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/xogenivubidodegabowedij.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pnuop8qsdpahv57shlel7fruk0/15557516436.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/30667335242.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ti7ejh5eirfqbc4edcoq9nud6g/78015120049.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/9pg4cp32ifhtrjpri1nblraa9e/beluv.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/63900335020.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/getirazedusojijunopotojir.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092452e29a49---rifibona.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kurazi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fa2ci5o59qh50jhigqstaa9j95/bopajitijojoduzewag.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3ad9ea9f---bawam.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160734223019fd---gevimunomabamitusugizoxuw.pdfIn PDF document text
    • https://mmszke.hu/files/file/45575487092.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b377e28f6---70791378517.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/122ec6eacbaea38f0e7287da5f49c5e0/diguga.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://benhvienlaptop.biz/userfiles/file/nujavaweposibetuga.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16096e9b82917b---begozujikijomosexow.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/totajilatokegavew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dewey+learning+by+doing+theoryPDF 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_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 10700 bytes
SHA-256: c09e645e3598923018e1a50853befd3ea69a5f8a4ed6d0f1a34ee12e36eae06b
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 16684 bytes
SHA-256: 99975b1a58422a0b2a5d78be223f817525189fc9f687a78f7285e6efd7e71e78