Malicious PDF — malware analysis report

Static analysis result for SHA-256 af71816d4ae22ea2…

MALICIOUS

PDF

84.2 KB Created: 2021-07-06 01:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbf8983dd857547e381be2b13486c3cd SHA-1: 98ab093bc657af9f6c57a962a5fc643fc1392858 SHA-256: af71816d4ae22ea27cfe78b9c65536116311db13abf71919579bd9a56c102918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting it's designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a911a15794---butivojirojarepujirafe.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c5fd2eb8c2288ae394573d8fcecd057c/55259971588.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf28522e2---11612529454.pdf
    • http://project-lovcen.me/userfiles/file/visix.pdf
    • http://emannsltd.com/userfiles/mujop.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758abe5f1d2---72505905131.pdf
    • http://ligneus.hu/upload/file/20633819183.pdf
    • https://daynexweb.com/upload/ckfinder/files/jidutakemozopuvatoriga.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/kopewixadekasamig.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e48b7044c9a531eec55c0bbc31f0d7ea/21465478075.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/82427377154.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5b5a13bc---wijuradusizopinoz.pdf
    • http://soldearenales.com/galeria/files/99387685961.pdf
    • http://alfavs.eu/userfiles/file/vejimolatiwufunobi.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081556430135---18969621912.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f8b518e6---50293772249.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0dd0524406da3193687485635efd14c5/33449782618.pdf
    • https://music-group-store.com/upload/files/paguvamoke.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bdr0v5eq0ntm8pmasfga0d7rv0/40902512458.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/11929363377.pdf
    • http://skncn.com/u/files/32357239672.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084030ab31fe---jorewesatofawam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tone+up+in+4+weeks
    • 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_off0000e675.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16792 bytes
font_01_sfnt_off0000fe87.bin
b5abc0e5486b0accfbb34f79ba89ec443d7499d620d27fc5de04b18bdbd50ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 17544 bytes
font_02_sfnt_off00012cc3.bin
0b85789e06aae79c382b82204ec63769e8db27d0c7c4e28e1cd88d1e2c769249
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 10156 bytes