Malicious PDF — malware analysis report

Static analysis result for SHA-256 db992e8724617817…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 20:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcc1c1ba8a4051f99406a5809a32e794 SHA-1: d0454d72c5596c91514ecf6afecc540764ad95a9 SHA-256: db992e8724617817c21a1f3edc2bb85b56ce05b8a39cd5a11cca9aaf18c34092
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lecormier-menuiserie.com/www/upload/files/jimabevumonox.pdf
    • http://conganbacgiang.vn/app/webroot/uploads/files/7260094692.pdf
    • http://condosworld.com/abisol1/userfiles/files/96870394405.pdf
    • https://o2opr.co/userfiles/files/nakajoroga.pdf
    • http://klemanpince.hu/files/file/gegozokasozezazudivu.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/mezixixisukamapikajosi.pdf
    • http://sanjarbek.uz/userfiles/file/zizetepevotiduxarageduro.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/xuwip.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/sawapixixijimi.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8k353eb1g0t7r80rsq07dktfva/12607108865.pdf
    • http://zzps.pl/userfiles/file/nowupikivufebegitekotik.pdf
    • http://castrolmintabolt.hu/images/upload/file/72493189328.pdf
    • https://kurek-rowery.pl/user_pict/file/469795.pdf
    • http://stamforgtechnologies.com/uploads/vevirezafulafuvesasow.pdf
    • http://argyleliquidations.com/userfiles/files/rinoful.pdf
    • http://currycornersugarland.com/admin/images/file/80476355760.pdf
    • https://fentesmakina.com/paket/upload/files/466939335.pdf
    • https://autosaloncenter.com/uploads/files/72493943074.pdf
    • http://surmounttravel.com/userfiles/files/28132414408.pdf
    • http://studiosimonepantaleo.it/userfiles/files/6104736544.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae01c4c91---xexebiliwuvowikelomozov.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffdd2cf810---gepixek.pdf
    • http://tsnpharma.com/upload/files/59184274398.pdf
    • http://capitaldanceacademy.com/userfiles/files/26192498559.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+root+redmi+note+9+without+pc
    • 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_off0000b315.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 16792 bytes
font_01_sfnt_off0000cb2c.bin
878b88bf689dd810b364695ca77e90070b5fdb84031b973dcda65bc043a521df
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 10748 bytes
font_02_sfnt_off0000e3b0.bin
295a48f9c61b2945320f6f1ba2b33d007c1b1c324695ee70c9cda3eb884e2509
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 18276 bytes