Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73faafd6e23ed10…

MALICIOUS

PDF

111.9 KB Created: 2021-07-28 04:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5c6d06edefba5c7ef4d5ca7d1dc20da SHA-1: 236215f8634e6b10092e3c98e59054ef94049091 SHA-256: b73faafd6e23ed1073bbd4638cc5a6f74e5df304bd50d340694065ee0f0f69b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is designed to host a large number of links, likely for SEO poisoning or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://tpokebar.com/uploads/files/38168525010.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/62807442979.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4650ec7a7d---93195542860.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/kujesitawu.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/14993113178.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/dapugiwinudot.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/33660783749.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/jobamezak.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/q4ma9u7e95ef443fg6sv5qffgm/duzodunojopozuduwuzuzaw.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/zapepovi.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/tufilap.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/17179183461.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d405a626a---44230245043.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210624110941_dpilzu.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/zulonuvugosuberiwonavex.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/58906091154.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/85827835027.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gewuxoriguwolavekos.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b5cc452b---xexelu.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/17435178391.pdfIn PDF document text
    • https://mollis.rs//files/ridimupepotelebuv.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ae48d50950t6bu5cqoi6fomt6v/bamidaxozal.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ec46e0d63fcf7cf7098a97f4032eabc/51081456700.pdfIn PDF document text
    • http://newmob.it/userfiles/files/finezujomufafageji.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb08a483c1---madumubepanovekozigowopi.pdfIn PDF document text
    • http://newmob.it/userfiles/files/58260396339.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09e04613d---muxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=barcelona+vs+real+madrid+2016+la+ligaPDF 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_off00014c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C28 20292 bytes
SHA-256: 44236d1e57a52e68edb9cb3060e004edec5331d9ede17203fa916031f0bae829
font_01_sfnt_off00017e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E99 11196 bytes
SHA-256: b0c1ed3c31a4108071ec8cc7cfeb3223c203a40f5ad6cf22a081574aa71e42fc
font_02_sfnt_off000198af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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