Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cfd2e9984e290e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 05:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69bd891975e0c17b4af72617b4a2f8b8 SHA-1: 77d01dbc1f1ac2587518fb26bc11ed33b99aa96c SHA-256: 45cfd2e9984e290e2ed405c1de769bea02b36a7bb9e6dc903ee1c5162221fed4
196 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as containing an advance-fee scam lure, indicating a phishing or fraud attempt. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://cungcapbaoduongcuanhatban.com/upload/files/nijiti.pdf
    • http://dtyxbpzx.com/filespath/files/20210905013223.pdf
    • http://technestudio.eu/userfiles/files/sotijiku.pdf
    • http://fluitec.fr/ressource/site-image/files/kunulolupawudapomib.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d25ae3773---sagidesuxi.pdf
    • http://morard-mcf.fr/data/Files/mumewozevenofojumilojat.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5bc0623f---tomuv.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/75ae22cc7cc1e4ab7f028ad62b92c7b9/lofozamanekom.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/81386084831.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/vibobudunetiboxisabuw.pdf
    • http://universalestetic.com/userfiles/file/fosarepi.pdf
    • http://almawred-sy.com/files/adminfiles/files/nesuvegaragonida.pdf
    • http://canissapiens.com/images/uploads/file/86864992941.pdf
    • https://sharks-cz.cz/images/file/tegenib.pdf
    • http://arabstina.com/ckfinder/userfiles/files/96192100107.pdf
    • http://studiolegalezullo.eu/userfiles/files/27511749909.pdf
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/dabuk.pdf
    • http://fabriziocar.it/userfiles/files/zigusav.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/74913803532.pdf
    • http://dh-life.com/ckfinder/userfiles/files/tudavapuvetepumobejobe.pdf
    • http://fosterfreezesantarosa.com/uploads/files/motuju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=v+bucks+4+free
    • 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_off0000ca59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 16792 bytes
font_01_sfnt_off0000e26b.bin
cb7d54bf4fa62bcec18d8b8b461d375cbe0a9f30013c3264e09c7de4e56781ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 18236 bytes
font_02_sfnt_off00011200.bin
bc696cf3f3283e425985863f2e7466b9e33a118779f47c79faa50f074a53bcc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10088 bytes