Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16a931279e77c08…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 04:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3039128c32aabecb67df58bfbc9ab641 SHA-1: 3540130ff8854782d7ba362029a172bd171374d3 SHA-256: c16a931279e77c08e58ac65b534176f5dc0b3b2a683c24f1fa3986d6f880c528
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting, indicative of a phishing or credential harvesting campaign. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed banking instructions. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb1893e435---6936289922.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f19697a42---kenixawupasodukipi.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/1f3cff0adcdcc737522192e1039e684c/30280840296.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d0297e7e18dcda8ea85811161e4b50a6/58650691505.pdf
    • http://scandirent-new.ru/uploads/assets/file/tebenofebozonibakej.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3ee47575b4d99779f3b71417ecc46da2/29338368156.pdf
    • http://cn-junsheng.com/upload/file///202163141232315.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a0ffd8975c8dc55fdc96806b51bc4e4a/22838404338.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb100f83e---25734546528.pdf
    • http://sattamatkapatti.com/userfiles/file/10004052946.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0b9lequaoaqjg7vu1vfb95h08r/weputanosiwizumaxomagu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608c765f0bbd5---debuduboteretur.pdf
    • http://short-story.ru/upload/file/dinubeben.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd0ed3cbe---37828611893.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/bijuziza.pdf
    • http://simonhoirup.dk/userfiles/file/xefanumepijev.pdf
    • http://araonline.hu/uploads/file/16289676394.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd93327fced---sopabuniwupugakusijesenu.pdf
    • http://mistral-paints.cz/userfiles/files/44484407156.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aab6865e7---6810448874.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/74655126209.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pefewejutimes.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80dff01e1---63168539204.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/174caa575c47f8d9607ee1586a7fd9b4/63748759875.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/zizewijefe.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d4f9427b4---90921285763.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=if+you+are+undocumented
    • http://pro.ovh.net/~tribuene/images/banque/file/tufojaw.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_off00010881.bin
adfb4c3ba8155db0d4ecfe3ed4dc71d7715247dce4498d86a8462ac5d1b28a02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 10496 bytes
font_01_sfnt_off00012062.bin
7d9c8256df48f62d7f50734881dc1cbc463c6c5c36183421fe779aebf1e07b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 16992 bytes
font_02_sfnt_off00014c6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6D 16792 bytes