Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a933a92d8b7c6d6…

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 12:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21470ff4b25cec39d6151803d2e2d7a4 SHA-1: 7c8575ea46f1a967707c348d39a827e93391ba4f SHA-256: 4a933a92d8b7c6d600b00dff334c4c933149c9193c54b60dddc05ac6bbf6451d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=red+canary+pet+shop PDF link annotation
    • http://woorymart.com/userData/board/file/goxizogixed.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d934e231d6---rumulolevebenuwowi.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/rilira.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777bfcd59bc---xojarubezozemoxubulotafop.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/64c1d91829fef68d282cb6f3e50f781f/81268320651.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/786cf17c958b51d6df19a964f011e75b/litemimotiravarojavilase.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/lawodap.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/fc9jtoed86ehqv1qc783o4nro6/vitoponax.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160944ce546a8c---bojudidiwulijazevekafog.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10abae78b3---6407744203.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/14706876594.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf6c76592---mivokimawuwo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32495160a---75577877012.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/ledefima.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/teu0ibrh7c8ea0ibdj3manid4q/jeruresemujokozomoxazule.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/deluwugol.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/87317162424.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd0b59e16---rigisetokimam.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e053933b6---24857364887.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1e7f2ba303a93bb1f742bd561bcf6c32/95411142120.pdfIn PDF document text
    • https://angkalaris.com/contents//files/zinuxawulafinidite.pdfIn PDF document text
    • http://surtek.biz/image/files/20150103_021526.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f584f24a18---beworovarulukerogowigodob.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ndnogof772fbvugiev99a741nq/90557266510.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/96929189915.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_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 10632 bytes
SHA-256: 9d13dc7eda0a099248758a5c83f9921de3ec590525411dbf62c166e1906cf6f3
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 18764 bytes
SHA-256: af152764b7da3effb4d473ce61a601f1d73225642d6365f0d5af7dfd1af1a96a
font_02_sfnt_off00014102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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