Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdb6d78635dcfa0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 00:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64ab44f8e90eb3da31a20c124fa6c257 SHA-1: 6a9c6d59541ab3f27296bbbb9f7e9ca4a82a7b3e SHA-256: bcdb6d78635dcfa0ffa70a3a2a5cff63ede9f6d028400f9262da4cab77f8160f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to various websites, some of which appear to be compromised CMS uploads, likely intended to host or redirect to malicious payloads. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aimhc.com/userfiles/file/15007906671.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e6729e96---xodulori.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a290c2e134c1352b759fb988554413ee/surokefunakokemuwuruvitor.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/52155187782.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a9b35921dd0aae3319d0887764904efb/10440608378.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/79086616300.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/sapexuvozitibaga.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/27620645726.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/shc4kuvhcmb31oom4ij0uspbe3/lalowizaxomonebenorude.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/delupuderirowafus.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/mivugifewi.pdfIn PDF document text
    • https://advik.net/userfiles/file/55477189774.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8252a35cd---kisuribodakuto.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/32290398854.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/21297605688.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///gutarotikagusafifikur.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdcd41c53d---lerakivokima.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d6afa9b43---74489800295.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zaguzovizoxoxagopu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/91267669c0ba533e8dfa80a5818af288/goruberefimikulof.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/kekuxafekikinezukafar.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9b2311bafeccc0824e1373197c1bf827/34233249302.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ad126e75bb1508c297a176489f66afbd/8707744450.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/92be95cfb545d19319d49aae1950af97/xaduruxexulebomirev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=convertisseur+pdf+anglais+en+fran%C3%A7ais+en+lignePDF 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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 11068 bytes
SHA-256: b7169ad6bdb91e435a07bebd554c862aed3853547c2509f17e6b5bc3f1341ba2
font_02_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 21560 bytes
SHA-256: c8d6e72124a3296655eb39a4832e9ab386d5a8c233ac9c7a79d039a46b2dd95c

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