Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b09f534de055de3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 04:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d32d1d3314268cf366f901434417071c SHA-1: 793282c4b43965070a6287e12bf847c8e05a1a34 SHA-256: 5b09f534de055de30fc072e8e170876752e1298a5165cc635bf740f72c589783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm patterns suggests the primary goal is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=contract+de+comodat+apartament+pdf
    • https://aplusadvance.com/naver_editor/data/file/72655358237.pdf
    • http://lindseyderence.com/userfiles/files/6938653985.pdf
    • http://www.prieteniitehnicii.ro/documente/file/fefumewozojegejuxif.pdf
    • http://namjapizza.com/app/webroot/files/16865861811.pdf
    • http://autobedrijvenindex.nl/images/uploads/zukiwotifezuwosomufuzizum.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/lazuvumubopewit.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd47e0977---78464815479.pdf
    • https://smsenerji.com/resimler/files/78281798858.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f684e672228---nobejukeguxoruval.pdf
    • http://isvpro.com/custom/files/lawutibulogisu.pdf
    • https://dudikom.pl/userfiles/file/kolalazogogavuneginola.pdf
    • http://herfon-machinery.com/images/ckfinder/files/20210823194759.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/sejagi.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160755fda0fb46---sezuboduj.pdf
    • https://argekaucuk.com/nbg/upload/files/zepusujozujuz.pdf
    • https://electroagro.es/pub/files/6825055176.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b451e45b0---56781211897.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e504366083a---4199439294.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b5c47102cc889cc1e3b35c9f396a790e/bikuvijaxijal.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3005534cf1cc6f7e8f80042db1b044e6/19848439951.pdf
    • http://stelmart.ru/userfiles/file/22938067988.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf02c8e9e---vojoreja.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9eb093218ce3b401bfd34796d584b72f/kalezepa.pdf
    • http://agcslohian.com/userfiles/file/85551745687.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8b.bin
65b04911362f7437503e2e361f1265d2c929fb5c46cf3fdd53d78b63920306c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 18552 bytes
font_01_sfnt_off00010c36.bin
14eda1273f738382522b20aa56cee749157f0e71d725037c3ef4197f63711a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10508 bytes
font_02_sfnt_off00012423.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 16792 bytes