Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b96dfec8e93391…

MALICIOUS

PDF

89.7 KB Created: 2021-08-13 05:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f2e4e2bd82cfc153face76ffe1ce89c SHA-1: 2a67c9ebef2ad6a67905424377c8c59f8df4ae36 SHA-256: a2b96dfec8e93391c1146151db49e3a401dd3a97ff98275f87a46932e357a1ad
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://escaletravel.com/userfiles/files/xurubodeb.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73c91e0c2---rolop.pdf
    • https://congchung7.com/upload/file/xovexajarokamutolexuxen.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102e14ce3766---zezuw.pdf
    • http://aire-limpio.com/img/editor/file/51410129312.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080435a761b7---92501338585.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07514ae87---75980683927.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/wenavixikanabas.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/10cc1ffa3ce2803caf6aeffdcb5f029a/gaxuwiw.pdf
    • https://foulardfotografando.it/file/pokikeriponazadi.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/59255105295.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/91476698976.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/76258211517.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ed46c142ea9---wipok.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8f6c994d---91224880692.pdf
    • http://clairerolo.com/userfiles/file/derip.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a438585da32---rotafaxikovifudabe.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q3b269nga8fi4ajnrogelu1vi0/10420640998.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607263bc85276---40972202315.pdf
    • http://learningkey.org/userfiles/7689880081.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ab361556---22675775933.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fa259d420672296b6f4da49d74417970/24114842610.pdf
    • http://omni-links.com/images/blog//file/vadudobofi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+does+one+become+an+operations+research+analyst
    • 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_off0000f886.bin
1bd16e14c177283c137955dca0256071af15bb4105d643d8fe1f69725be6b3de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 17356 bytes
font_01_sfnt_off00012603.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 16792 bytes
font_02_sfnt_off00013e1a.bin
0030505c95df96bf6762c8e0969120a5eb7cec7515c4477258392fe4fecce58b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 11112 bytes