Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7abf65b9198be51…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 18:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7330f5fbdf4e101eb1e0cde0c2c30dd1 SHA-1: fcc510cfe8246391eb0149fecf86d1d32ca8848f SHA-256: a7abf65b9198be51e19ebeaa59ae98335f01c2a8d6fca0a371ee3f9f532f2bce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artgreen.vn/attachment/files/55619826931.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fa6c0f22---99381134629.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/45751389352.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/56576873625.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9br24tusq606bffh6r9hjcctg4/lamezadokeluwizovij.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f64f083186---detusup.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/zalutesesuz.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/88423562911.pdfIn PDF document text
    • http://poliinc.com/upload/files/69150987682.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/54274166293.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/30626642928.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/69493931015.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/zomoxijawewavarud.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/ditigav.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902075134_3gehgh.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/56584881594.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8132107b---86250570098.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/44536419190.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210921020705.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/76651492639.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/midabalebexekub.pdfIn PDF document text
    • http://builderall.info/userfiles/file/zezorozo.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/pizigatadogop.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/18314557025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+survival+fire+gamePDF 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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 14664 bytes
SHA-256: e0a3f76d00ede8543b96ef40e78c3bc47bd9dc1cab38467fb8e243c79cb3d714
font_02_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10380 bytes
SHA-256: 8890ea09e3b25797f1fc01c553ff2e74445c2f8fcdc52ef18701f93bdda48d50