Malicious PDF — malware analysis report

Static analysis result for SHA-256 599c1e67d0f403e0…

MALICIOUS

PDF

91.1 KB Created: 2021-09-09 01:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fa6f488bb6ae9121b37aa95a411430d SHA-1: cacc6a3a9ad532371d2a98c310d40cc3910f59f9 SHA-256: 599c1e67d0f403e026b0b15c8666498c08a4478dd513368801fd571255965135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://393citizen.com/upload/files/82553241495.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ivuhk4s3v6eql1ei75214p5561/9701147627.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/xemejopixidu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/g8l026dplt39aep0qvdufpkrat/99705212791.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/82922828120.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/90469508626.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/139502494.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/ximulegudifagegepetu.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/safezipesemawilevoti.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/gogujusakojolimaz.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/78862083667.pdfIn PDF document text
    • https://kaparatt.com/images/File/33920975973.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/238206695.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/65579614262.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/tajifafe.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lexebezemipab.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b309c73---94891248167.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/suxevakisugunuziminabes.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612ea9e231ebc---xijavaxumorusudosekotede.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44065703385.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lupawaxigipinur.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/jukaxidezegapuliwefutizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=up+full+movie+hdPDF 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_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 17228 bytes
SHA-256: c98f4dd7b8dc95480af8e7fa3369b59e3b5a588bb1597cc8608dd6bd0d1774cf
font_01_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EF 10304 bytes
SHA-256: 34160921c032da20571ddb96e5b963c8fdbab67597aab2576a0ad0dc2912e9f4