Malicious PDF — malware analysis report

Static analysis result for SHA-256 439d578d895f3155…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 07:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcd34abb59b337aea4f4a30b2c95cff1 SHA-1: 78d09b86083d57d17fb4ae183260af6abe723274 SHA-256: 439d578d895f3155c63180efdbcb667c6b69db398a31eaa355c27ce0cf867cfe
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's used to redirect users to malicious sites. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb8cda912---20780252561.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b660cdd425f---94183262919.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081378644e1d---wiferemagatibulubatop.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c950b996a03---66019303638.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b4638d3149d2db6c116dcdc7cc3686d5/15014489836.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eb69f36a2c24fa7f6c3fb01b5042955e/guvikibagakadiwijejaboni.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qrbk7pteclucd1hpmmfebnapae/sutowametuguvemolurasuder.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7795fdf84a---116622910.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8d6d4bf02d6296070c2a3645df1afaba/11515713223.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fecefbfb---16076633387.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1922e1ad4c---fisuxamaturupalujomete.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/gonufe.pdf
    • http://kaies.cn/upfiles/210817034617525855f1gmga.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/97442925575.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f84c95a7---4701447336.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d75aba4f---nafaxij.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096749b45cd9---wawavivekoviremuvawuj.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3voeoqjhmupc85vgttg2qge9qe/35722270898.pdf
    • http://esoftland.com/userfiles/file/14604398027.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/l4370p3hmnlbl8tb4jhldi5hku/11575140809.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c618a7cdaf2efb110ec22824fc1bd27a/gitemakumop.pdf
    • https://cli-kh.com/uploads//files/202108080950389238.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2008+toyota+highlander+sport+manual
    • 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_off0000d1ee.bin
5184ada97f8662bf32f8ab77fde6b6f202683cffb4402dbe6c3d097eb3e65c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 11404 bytes
font_01_sfnt_off0000ec85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 16792 bytes
font_02_sfnt_off00010497.bin
58d24563db18949d203919b41d7172f64b2ee3c5e76bdb6256a2f157c1029d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 16812 bytes

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