Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6b1948dea18fda…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 15:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 8ddc3eb3e65bce6eb4cede668560a36b SHA-1: 5b5dd2799219525cbcb211b84d45cb0233d493bb SHA-256: 9c6b1948dea18fda15ce290b5d07c92690637cd7871703c494364f254fe637bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into clicking malicious links.

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://crewmak.ru/uplcv?utm_term=best+python+framework PDF link annotation
    • http://tinavaron.com/ckfinder/userfiles/files/renunekenoni.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/buguvubim.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/xitiben.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4369557aa---figivozoxus.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/zaxefubewigar.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac98698a4954c0c43d59eaefd27e51a8/71474091617.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/46758724717.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/39881527834.pdfIn PDF document text
    • https://jobtiara.com/files/files/paxabosipukojoloten.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4ef27b9579696b945aa56d558e6df2cb/nejuranapufura.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/54789360735.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/biselu.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/13859587264.pdfIn PDF document text
    • http://almavilag.hu/files/files/pogurogisenavom.pdfIn PDF document text
    • http://fabtur.ru/upload/files/31188459188.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/tatutun.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/19021680760.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/44895891435.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5f6ceb30---jilanavexefazi.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/71181306454.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gewipovumenepevumegunifuk.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/77831898454.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/83979189282.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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 10828 bytes
SHA-256: c8382550299546915dabba6ea09e14e9e45a67f584d26b8304db4e0ec5fb1859
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 16620 bytes
SHA-256: 894f8093a2b73d5ddd813ac65ac49f7fbffe83d5a133908cc2d30148f5c5e8dd
font_02_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1