Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fbe6e7b809bbd5…

MALICIOUS

PDF

108.1 KB Created: 2021-07-22 22:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c6274b3dd82a34bef9dc84573a8f0242 SHA-1: 03467350764f2e72108f2741c137661107ef9b7a SHA-256: 12fbe6e7b809bbd5c67be96db45203bb638a4496bf6eb304066618aa9c210869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous unknown URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6efa814150---64840524764.pdf In PDF document text
    • http://ekonopuntos.com/campannas/file/3474415286.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/gadolusifunetezoteke.pdfIn PDF document text
    • https://discoverthesky.it/file/20291908302.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210510074703_1680586959.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/bpmob485v4s3ar0o8bekrk4226/pilifugezupat.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/nuvavufezibij.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-13/20210513215048777464.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/32679366694.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/88430054207.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/98764133304.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/41241960293.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525210758651853.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a2ccb835e23266636debf330d94c078a/pawakaxavugun.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ff36aefeb5affdb74ca2990ffd7855fd/58136454854.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/navopexojobotabuxifu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/72948032917.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e9e19c6f9b20b2906a5ff40415e1a6a4/370824781.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/836b5b4b951445252ae80f1ea02115a5/jenupefufumimo.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/3488373997.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa5ae6438---luralixojexidogajakiro.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/buzunexebetolijinologisi.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pogabezijazetatitax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=note+taking+guide+episode+302PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/79528528fbd6a5bab0b10db895746852/zasutupevogozafusupow.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_off000141e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 11004 bytes
SHA-256: 367a6bfc3f9c03fa715c2708b1d54b56a5c91f21c090021fd0971a737591fb6c
font_01_sfnt_off00015b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17390 17748 bytes
SHA-256: 87f586218d667d45e0b54c071fe2c923e048558049d45258105cf11b2237fbc4