Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f405bdd60f0a216…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 23:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae3aa2d2ef4633ccdf8d2e357c224d58 SHA-1: 34f9163ba0f3499f42ce62a2c4895b7cc9f69202 SHA-256: 8f405bdd60f0a216da15a73136a00a0a3a29620f2a3e775a9b3d12e5d9a82af1
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a phishing or malware distribution lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431d4e8c271---zafefadenel.pdf In PDF document text
    • http://e-park.es/img/uploads/files/40348460692.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/63980327708.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ed4369eb708ade4059a502bd78dd28e7/midowogu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355bdf751d2---mimulajiloxi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/11131882532.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/68971022474.pdfIn PDF document text
    • http://budropol.de/Upload/file/44009169943.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/sugafilidepepuretuwedazi.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/17602326352.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/talud.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b536936199---zogovobizagodix.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9fc601093---56038341007.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/gebaxebaz.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/54311902609.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/3032337139.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/68864988239.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/goduzigarusiram.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/38797990991.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/24803239385.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xapupusaxakaxowi.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/46217427346.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/80145709684.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/92999045454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=htc+android+update+software+free+downloadPDF 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_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 10792 bytes
SHA-256: 181d6af4001a29ec512fb420891558a22c6cc930aad542960284017b512ab251
font_02_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 16808 bytes
SHA-256: 5146d0117dba4be5d33d2a6b71c40896fa6da42e5122e132af1550c81b9b7638

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