Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa1c014fe59306a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 19:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 698f891e63892aabe284d30c90207090 SHA-1: dbed6726b7dffadfbfc351b564325caf02b967df SHA-256: 7fa1c014fe59306a0a874c0279965b9056bf85e68fdb66f778c296980de1186e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hr-serdahel.hu/images/file/6151646391.pdf In PDF document text
    • http://atek-ent.com/upload/file/maxupanajeletajimonu.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/terirokosofaxuku.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/22284138021.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2de65da48---14324206505.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/gezozi.pdfIn PDF document text
    • https://datajournonepal.org/files/40202568295.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/gefakidemalukex.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/64443762003.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/80c17fec20a0a4327bc21c645e2dfb7e/2466727226.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/93264140455.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/45410046044.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/47644159385.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/50088433863.pdfIn PDF document text
    • https://slide-bearing.com/d/files/70395529890.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e4766732---60504185408.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/53afbd110944ab60e48b92075c01fe14/80290111265.pdfIn PDF document text
    • https://campermagazine.tv/public/file/suruwil.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/39140119493.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/47790968952.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/gitesow.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b89f13bfd---99484524930.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/sifakapurebux.pdfIn PDF document text
    • http://isvpro.com/custom/files/bibajedutomul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=active+learning+articles+pdfPDF link annotation
    • 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_off0000bcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC0 16380 bytes
SHA-256: 84b6128420c40d70a23ebf90632146e4296a3bbbae699fd6c4e84a2083452cf3
font_01_sfnt_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10720 bytes
SHA-256: c916a7e61010804e0c1c846548e94bc830b2afe3f4d956d82edf2a507d060130

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