Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1b6950aef51109…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 12:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91f0406a2a3cf0743634f08dffab79f2 SHA-1: 2d9cbb610ec0cafb670ad5237168c4895dbaf497 SHA-256: 4b1b6950aef51109a0fc40f62ad3e0ec46f86a369e037415f74f923bd303ce84
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates a pattern commonly seen in business email compromise attacks, aiming to trick users into changing payment details.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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 https://nhahangphongcanh.com/uploads/files/zukixetilojozukekopexuzor.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbef234ea---dotegodisiruxeruloxi.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/ziwumigodadu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/32410982744.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901195749.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fumotabusabidi.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/29314142642.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/dakoxur.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d440b1d87f---84655566602.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16306934970459.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/bozibevebolipugudixonaz.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/xotirixuro.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/42763132099.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/suxapevafemafisabowale.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/polixibarajekus.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/73450476893.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/negusudol.pdfIn PDF document text
    • https://biodez.lt/i/File/6403594412.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/repasijuzo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ab432ed140c62c715c65b84f554dc6a6/nawumifodapifeludogafu.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/90608480353.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zikuwaboburitolarekor.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/82294820959.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/mamolopatipiwutevax.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/36479446738.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/99862590283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+transfer+viber+messages+from+android+to+pcPDF 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_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 11200 bytes
SHA-256: 21a55730612c34e0136b45e96d15b185a0290ae5aa57bfa16413c122c699ce1c
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 17868 bytes
SHA-256: 44b4a120350bc36ef8211c3ad9cc2ae044dca0ad0fd9279f959ed72a009ebcf6
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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