Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ba2d1b9f4b4b19…

MALICIOUS

PDF

98.5 KB Created: 2021-07-25 01:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a31b3bab45fe4d04f86475e83ce6d377 SHA-1: d959c6cd29f7e452a1e76dd97cbdec384777dda4 SHA-256: b3ba2d1b9f4b4b190cc3a9c0006b70c2796e5453530b1a719a35d73a5728cc35
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress upload storage and disposable hosting, indicative of a link farm. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests this is part of a business email compromise scam, aiming to trick users into believing payment instructions have changed. No scripts were extracted, but the embedded URLs and heuristics point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/55713582860.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3918ca4b3aa591bfd0b82f9c53aa6ac2/52714655992.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6df30588---kaduro.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0726b35f8a---79616156540.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/85878111707.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/muruwutubosejufevanudigad.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d53a23dab1d---jamobizusararujojo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d7fbe6408e0853cf1ac6b97214fff6b6/kajasuwovi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b120a2915d3---jizitubobijada.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/86222946516.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/wubiwajovofegezinifar.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c3232a8730588820be043e5683e9f096/57077022155.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/vokaligixupurex.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/461873b574ca68341abeb7c557f969e6/widipapukamura.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080720615e66---86382160727.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/61493572086.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb108a84e---35770402629.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/631729b84490e2c90ae744f498652ee0/gudolewiged.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/80036517570.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/65340765042.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/59681592719.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9f7672e0---90922290213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+check+ehsaas+program+12000PDF 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_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 11040 bytes
SHA-256: 03eb1403f8269de85ab0255c100720122975b9fa5563e7dab8cf325cc352a2ef
font_01_sfnt_off000135ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EE 17164 bytes
SHA-256: 65aee7a4d349d863af79014543dadde415470c78bef53a2e9580d579f85fa88b
font_02_sfnt_off000162dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1