Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86f92ff4149a00a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 23:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 543d8c60a74f5d686059ab81150bd58d SHA-1: f7f888f952c51716ab4b0d8986f513b73667f3cf SHA-256: b86f92ff4149a00adf01ddd932ec81fe0cea0330f649400189fabad09dc6e789
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=launch+x431+creader+vii%2B+manual PDF link annotation
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/desubumo.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/26644592685.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096f13fe6082---85227524670.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb6124aed---48114209500.pdfPDF link annotation
    • http://pho32shabu.com/uploads/files/40140022226.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/95437263947.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/65bb37a1f446d02ea45527a9823c7248/zuwemebugejonelezekoki.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/aee62c6ec173f34409dfc35279ce1719/34170321837.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/91761724420.pdfIn PDF document text
    • https://webmenuplus.com/images/file/92560264281.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/14d4a514cc23c01fe02d999aa99b3c5b/14217545961.pdfIn PDF document text
    • http://orem.mn/uploads/files/texazavedunititiwopetali.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ru3dhejiupe8svnnssee4ldh4j/55676707156.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/zudetovipimokegavasa.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/vimivutexonuzop.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/wojodixaxedare.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/zufelekolomewularoj.pdfIn PDF document text
    • https://tsolisp.com/files/file/49859717378.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac28026369---47394066211.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/rutukagazidonomawapil.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/91143569931.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/89411856554.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_off0000bfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 18416 bytes
SHA-256: 9a9965fd5b49a37e3244c72621ab2625262e9f414643431de171e630254edb71
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10776 bytes
SHA-256: e42d5ea3392b601a19b776023195c8cfc1c8d07f522922acecdf2514f4626e4a
font_02_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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