Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78057daf8224bef…

MALICIOUS

PDF

85.5 KB Created: 2021-08-07 00:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c79aa8fa28ad7ec329a4ea025b14888 SHA-1: 3f54588ab26d92bd156753b138ba47f4bac07d3b SHA-256: f78057daf8224befa9d9f89859929b92c4ea6d6505618f99939fdd74efefd3c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The file's structure and the nature of the URLs point towards a tactic of using a seemingly innocuous document to funnel users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://crewmak.ru/uplcv?utm_term=the+four+color+personalities+for+mlm PDF link annotation
    • https://fullgame.hu/uploads/files/befewazevovis.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/27381637935.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/82515635783.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/52034705135.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/55590900346.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/meralegokis.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4fadba42957c940435c83f00ffaade7d/93005268953.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/rumifano.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607468a93a32c---62516996546.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/zazutirusakudofovavum.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3j4jm12uonlpng98u6213htao3/surepolowagaselasumiwedow.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/76760307190.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/23108073641.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e4e3c76ec383f1af433e3e30b30440a4/66216109485.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/26963930864.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/pql54u5a7lobj3cj3cdrbmej0a/21105891099.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/bemobafagituri.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19bc78a7---vesunuxol.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/31eefef5fde1279b8d5bde6de345128c/67637436968.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fcbfeee69---90756137698.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/83937683241.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d47eea80912451b7b85eaa702f303d6f/rogudajerogu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8e974b7d4---5974879882.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609596d066967---pijobode.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/bozovezifajotane.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/fevuwuken.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mamvgg1vap5fum8h7ffkdufro2/mobagavup.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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 17104 bytes
SHA-256: 3bc4c3ec4dd35d2443b3d0690e31f85566aa71e869b232075590d8103a7b17f7
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 10808 bytes
SHA-256: 93014b4de80e830205c924bd83b460c470bb0e815884240c671606bba65d2c8f

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