Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a130195bde5c2eb…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 23:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e3608d338c0b172fd257b22b1a921c1 SHA-1: 819a32e5db2cd561e43dd5e6f1465c51bfa3652f SHA-256: 3a130195bde5c2eb5e7c9efe03263dd0ae09f455aa277cd4c8960f771d5b7903
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eb658e71---vevuxogalexovekarum.pdf In PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38108696891.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/93974310613.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/60255242429.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/46549927892.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/62864426539.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/30065313963.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/fuzekig.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161423acc73a84---39286256437.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/26483296245.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/jolirig.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/81536514084.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/88289611840.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/nevavojuxagor.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/razezub.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/jozudarufufodali.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/25254562019.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/6097541679.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/24345758025.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_031836.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133db429eb82---17395711521.pdfIn PDF document text
    • https://chp-travel.ir/data/file/54028359747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=short+oo+wordsPDF 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_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 9972 bytes
SHA-256: 5b67d94fb62871124e835669132c3addaed0913edf3b173062f8f9afa0be8b3c
font_01_sfnt_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 20820 bytes
SHA-256: 4a1d77c215ddd73793d6d55e959988b890d9776de6b71ce80c8bc92d235981ea
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1