Malicious PDF — malware analysis report

Static analysis result for SHA-256 689e3b47ea42399e…

MALICIOUS

PDF

93.0 KB Created: 2021-07-29 13:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 52b8daa77b92a5284c9c05ad8a2c2b32 SHA-1: 324876bc198b85567b09309e06645183274f0fdb SHA-256: 689e3b47ea42399e316e380caa26f1035a110fb9b92d76f16bb25751ea5ca11c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lapempi.nl/ckfinder/userfiles/files/89174401985.pdf In PDF document text
    • http://grandinhr.eu/images/user/file/kupunajinipa.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/90623849058.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/16b33722046aecf3f7442dd64dc75e12/80924499482.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c95fe937a---godijorotanerof.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/69974602818.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7ec8286371ca3d22326cf2074abf10b1/pafuxefularatoteduk.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jiremoruzukep.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607573fc58cf7---wopixezimo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/i5jo5tbphogf1aoecncvgqdbnk/fufalo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/80657860143.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a5fdd99b9f1cdeb6f8eb11dadbe78e54/mineditelajij.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210728171754.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/88476160051.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5bea4699---bidiseniv.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/fevebaruwuvinoza.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/99364462458.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rixavojigawopozenagobe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609083ee3e3c3---bozusimerevi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e0405a8792357a4a3e732d2e20d1fb0/sodaponuronegivoxebaf.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/20146069755.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/luneberojep.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/54870850389.pdfIn PDF document text
    • http://airsoft1.ro/files/file/1949688743.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/25424672104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=god+of+war+ghost+of+sparta+ppsspp+iso+download+200mbPDF 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_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 17332 bytes
SHA-256: da979bdcac0dafc0ebed8026ea7309adee5f79e7fd6515b710328e2569e45b32
font_02_sfnt_off0001488e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488E 11320 bytes
SHA-256: 2e68b0e218599c8fdba9f97d0ea4bf5faa6e243f811ded56cbb9e2e09cfc45fb

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