Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9b942b2bb29208…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 21:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b27e6b9af0b6ccd55c495c0d9b808bd9 SHA-1: 8dc8c949c71ca8850a2c16ed812e7609d2bbe5c2 SHA-256: 6a9b942b2bb29208b6b651774cda36d70c65658f078b7b8296ec85c30f904070
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to initiate a fraudulent conversation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=greenland+gross+domestic+product PDF link annotation
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/10297184277558e42aaf6e34f0d5ea4f/dolefosixeworexinuzadoxi.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/2642c0622e93c77cb9d53fc623f37df4/7149235664.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165efb2744---rejozalifizawa.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fsj4omhsovma93644e96et8g0f/8235074510.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/24272663257.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/90387925211.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/87463715262.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/22732671623.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/26426712559.pdfIn PDF document text
    • http://imaginove.eu/data/Files/muguxoro.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7o3qs3op4g40arhdpl3qmjq84g/dufemabaminopalud.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/gexefipuxegevava.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/64854496866.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d65121b0---63738423785.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/87739499324.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609435038e55f---nipenipor.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gejov.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3328a9a19---97629040602.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f6d686ec9a569bc6c2a1cc3037ef7960/27704264302.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2bb6de93fbb3345af7da7fc4f4d78341/gatojosizuwazijabavekiz.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hl20h532vubsrnvfc6epinnus5/panakuremi.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/68429358912.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/mojixisarumukamotitexe.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160be0fe821d8d---vumepobojusupo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d478e44da---68061854185.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf4c63a2c---mumuwanoteropefowunetelog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10996 bytes
SHA-256: 1b0c8ef68c59aa1a0fcf2a2cafc1a2a112aece05b93da2ea434b99f42819d889
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 23788 bytes
SHA-256: d0825a85ec3d202b64213340d7324192903df5501969fbd9e3fc52f3ef582c18
font_02_sfnt_off00013c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1