Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7cebe6686d99c…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 21:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ee263254a1072962a7af73566f50338d SHA-1: 920ab5dd1ad22d37dcd149f230ff0ad18cf16e8f SHA-256: 84c7cebe6686d99c24e0687bf7b498c6a3456a99aee49142cdf81fc9d576fbdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure strongly suggest it's used as a lure, likely to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://crysiq.ru/uplcv?utm_term=sample+letter+to+be+excused+from+jury+duty+for+medical+reasons PDF link annotation
    • http://manilag.com/FileData/ckfinder/files/20210913_A68EDF5B52366E8E.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/49326725356.pdfIn PDF document text
    • http://fialki.su/74063235749.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/25433064688.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/27754101131.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/rusafogadavoj.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/suxop.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/jajologa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8f4344ac---69021780117.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/92773590475.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/zimigagunilaj.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20211001180104.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/20423246603.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4c0e0ccb---bemul.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/xukebamuvutenuxufukinoken.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/vulegizazosezavotuvinaxu.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/konubunizisowarusobesupim.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wiguluparowujevusawi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0d6b8a1d---pifutuwez.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090501381196.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gozatexuzupazaresi.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/73199263385.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_off0000acc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC7 15136 bytes
SHA-256: 7381c8bcfecf8776c93b10d183421f9ff368b1fd3008fcb4078e69b8961ff575
font_01_sfnt_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 11444 bytes
SHA-256: 7b5da7d2535e5249d927dfab102747f8e0c84f0509f8f8dc8b65cc6ec7a585b6