Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5bc2cf7944b5ac…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 03:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e791ab0e2f16e998f6b311c5a37255c9 SHA-1: dad01c5624460c8d8881d8e82e60a4477685b21c SHA-256: ef5bc2cf7944b5aca247061120d1967bf68f5fe5b62e5b4175c66339bc8a7410
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to host a password-protected archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document itself likely provides instructions or a password to decrypt a subsequent payload, a common tactic to evade gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=convertir+documento+pdf+escaneado+a+word+online PDF link annotation
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/puxojiniwoniwovewowekuz.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/sowudofisaponezekosaduke.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103f0a881a14---jarebutekot.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/48829cf43ef67a59b600fc60de265589/teduwowidevetukufiz.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/59499203347.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16088d6c9e4c0e---gevupifekixisuza.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9e03d153---4679873837.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b35d91a87a4e78a46f0e430a8b8d7f7d/zegutukipizironu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/87eus3f2iide7rbmbhpt038rmt/gazejolalopifaneza.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/36328793585.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/gubilefezadimolovawife.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9b8afd30---90545265290.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/siragaropepodigenezivogog.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6abcec3567410755209ef0e21051037a/3618386203.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704193226c3---35129911766.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/gepugifak.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ddde471fb34225a1ffed0b5c3eaf73d5/94407180258.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf906438b1---66810723053.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3704ba0940---fonapajinani.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/646ebb8faaa4591774707f12e9182482/dusoralasesujesojib.pdfIn PDF document text
    • 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_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 18348 bytes
SHA-256: 6cd450541ff1805c2cace1575efead0191cc8a5f365ddea344c562260bb2b750
font_02_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 11064 bytes
SHA-256: 04e815369c0896f32cb25136d44285ddac55fbf8af7684f0fae06fff9a7d7c38

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