Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe0a521163d6b5d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-14 00:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b753d7a8d71e4b94664825e9658cf392 SHA-1: ba955a5faa2c1733b1e3dd918f885b447042a0db SHA-256: 6fe0a521163d6b5d19b89e75328f7eca84f5b1aaa8341728ea6b8d9c1a8a7c50
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links and the use of compromised hosting suggest an attempt to obscure the final malicious destination or to leverage the reputation of legitimate but compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://moto-trend.cz/public/files/fck/file/mulumovelosirewuzipumawa.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0226ef4c---93958693529.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/sumefokosipabivefaxokiwi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ro7nbreju8srjr84ibgsnujoas/443685938.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/lavulazotovuxowuzug.pdfIn PDF document text
    • http://fedime.org/imagenes/62344042928.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b89be11e3f6---21395940292.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/nupadedimelakipexa.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/28085820151.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/wodisukukasigisiku.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zenovudizonusanuvumo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150524b1048---75777590643.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160850d68d44c6---5268639885.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/73727273014.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/todapinalagumuf.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/77423334042.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/29844342197.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/2820636307.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/9235187859.pdfIn PDF document text
    • http://hongdacable.com/d/files/jemujoxop.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8f0f714ec8619a89202858232ec44d10/68697325596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kelebegin+r%C3%BCyasi+full+izle+tek+parcaPDF 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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 11224 bytes
SHA-256: 622a1e1bf23ce8eb6f121c3b68dabaf7233ff43a5d309591842f688beaa904fd
font_02_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 19128 bytes
SHA-256: b3b2b0240aaf0df114396e712a189650106bebe4b87152fda8a948058ade1cfe