Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f4499fa6c0bcda…

MALICIOUS

PDF

112.4 KB Created: 2021-09-08 05:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76f871b166fa17a34771ee9fc2d6ecca SHA-1: 39636acbed16e017a7a1e2ffcb34392cb84e128a SHA-256: e3f4499fa6c0bcda3cd430f2d33d235a5ce5f4ea455ee7f091cc3da33a4b79cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=washington+manual+of+medical+therapeutics+36th+edition+pdf+free+download PDF link annotation
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a595790a304c47a635c00d5328351553/fuzederu.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4993850---bigigoladunabavufo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076657a58f68---93045685731.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fd90edc715bf91ab589e5db15afe7e1d/vunofexil.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/paduxez.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bekumufiluwororimes.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/juxukujadarax.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/99456385501.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d1099f969---56921551087.pdfIn PDF document text
    • http://newmob.it/userfiles/files/torixep.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/60373711936.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4317eb8a9---50444967168.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b316dd9c6---pidebime.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd2e1cca3---wibadonigepuri.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/23131007269.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/35719970538.pdfIn PDF document text
    • http://sro52.ru/uploads/files/20341378399.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/rexisarosekusu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r29vvnbre71a77ikmi9ucp3gbv/82834035346.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/17251818206.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_off00014754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14754 22180 bytes
SHA-256: 6cc778f924d15ccc3ec093489534b8f5557073b3e2b9ffaae8f4b58088a105c1
font_01_sfnt_off000181b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000199c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199C8 11584 bytes
SHA-256: b247f24b3e34d9299dd8a5a4296cdb88dacfe82193626fa527643ec62a2c2191

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