Malicious PDF — malware analysis report

Static analysis result for SHA-256 081a55f1c56e0236…

MALICIOUS

PDF

89.6 KB Created: 2021-07-25 04:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fe0c4e501cb482e2caf49be693d3b2c SHA-1: 77f976645a5ea791f07390c2d3c1d68d23b7ceef SHA-256: 081a55f1c56e0236efa4732352674892b1432c277f7f7580ea98f70eb9b8b89e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83bf5a53bc4605c13b132f0f7c3c6e0a/jomokuwi.pdf
    • http://files.ibiza-ferien.de/file/7735426865.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee570d21a---sisilatidobabegi.pdf
    • http://autoscuolemontagna.it/userfiles/files/88243861813.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6ba3a0ead5d947a3180300eeffa7e44c/satosafavig.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/nemurir.pdf
    • https://pichsas.com/file/vadexebodedobuvojukavaj.pdf
    • http://gildiamasterov.ru/userfiles/file/28793668467.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a63b82fd4---sexonul.pdf
    • http://mdsalon.ru/img/lib/file/sevuf.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/v6932ooihipl6l038hvv1cfai7/72919174935.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea3a58d74c---73732995302.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/bolekugor.pdf
    • http://www.anjhimayath.com/upload/file/57628517320.pdf
    • http://eventologia.com/userfiles/files/vunenadeberamerogakebek.pdf
    • http://minhledtran.com/luutru/files/15355498135.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c7f3a592db9de0102a6409f5a55129f0/864196648.pdf
    • https://ngonluathan.com/images/ckeditor/files/bijukisagogumuf.pdf
    • http://abwcoliseum.com/uploads/files/76152393760.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160928b4f360ce---17345682940.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92939298b---14734714347.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4e8884a304958ee33775b88f41886e2b/93009723862.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/26626dd6e0acb64020e5a61816ae3861/feliwakofeda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cricket+batting+tips+in+tamil+pdf
    • 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_off0000f8a5.bin
2cdebd43faad4f58a841d5d72be99a2e8d6ba52127e97358f6d218d6c83b4c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 11104 bytes
font_01_sfnt_off00011221.bin
652015a8a068a02d99d53d31f9c79bb46d1f4fd13769e2adb704fcf74890eb74
pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 17652 bytes
font_02_sfnt_off00013fb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB0 16792 bytes