Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b03487949bb1480…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 21:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbf33aebf5319b05347984d2f332bdd1 SHA-1: ba6d971ad07adefe3df54b31945df87ff181ecf6 SHA-256: 5b03487949bb1480f1a829bdc8cd25b8d0c611443970363e86faa817d7605039
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 URLs, several of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://mstreatmentadvances.com/userfiles/files/lofitalatusir.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/50446115288.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/surapopurupalojan.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/gudaburilejomiverebepi.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/bokudesupuzuvaguke.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/36177876238.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pitujatiwaluzezekovofiki.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/kawotudixu.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/081505299302.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/89205908670.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613908cbda749---5549138635.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/97747843192.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/mekopikuvatelerutis.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevafirugabepu.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/genuvopenofugilepazur.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/30824694541.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/kopuzalevovebufaredizi.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/81012194669.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/13449983445.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5f62df3b---tuberovuxixopukine.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcfc627f5---zajibemivonejidixinow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+tablet+point+of+salePDF 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_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 18860 bytes
SHA-256: 1035febf6be645283200f7a298f2360a48a3b52210056fa09c390633f0b56e8b
font_02_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 10612 bytes
SHA-256: ff15433a6980713d38ea719d0983da8aa0ed53669a1d82de650679198516fd87