Malicious PDF — malware analysis report

Static analysis result for SHA-256 924a6de4f1380f09…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 20:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80632154ce6f39725da29b2730cb8876 SHA-1: 0bbeae01251be22386c79eadc9aba60bec95958a SHA-256: 924a6de4f1380f09fb46f24bf91a71869092e0aa665e71208bf1a635dfe21325
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=nintendo+64+games+rom PDF link annotation
    • https://mintowncoffee.net/uploads/images/files/46166016044.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/43585043791.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/lefamugozapiw.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/5880213497.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/67041130590.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/98776322157.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/70151087398.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/degesuvibarizu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317bb20b884---52284662600.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/rufisuxovaxuperosatif.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/pozizugumo.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/jodoxutisobox.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/mipis.pdfIn PDF document text
    • http://methese.com/upload/files/94630662965.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb21c535a---senopumaxed.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jupilamelam.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f283856edc---12521901860.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/36086793630.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/fajiludower.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/zanarujib.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lukadejupazuluverumexukuf.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/xunivomugumugevan.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/29982264291.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/fitemurovuxo.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907213209.pdfIn PDF document text
    • https://sanidom.pl/img/file/34289236887.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_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 15984 bytes
SHA-256: 52892756f085415aed4d7c0702ba930be97628fb8ef47d7dd089e594aa74daf7
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 10768 bytes
SHA-256: efc45925f5ee83fea53aca8f135f2248309025c5b3b451b4c80fb8eaa52a15aa
font_02_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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