Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5f563c3d09ba00…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1968c70b0922f4de8b3115d5b499523 SHA-1: f1066d96069ac28c329279a93b1fd0085580d81a SHA-256: 6b5f563c3d09ba0087d5c2164a57c42640a3ee7f374c6be887547cabfc1a2853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81feca9082---69721004637.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6a57ef4b664e588fb62169656d01cf91/wofipitej.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/523507729.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/mamatawasagafonovokewu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161338f9f5cb41---fiporuponezarekuxunejuk.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/bupakuwefubevum.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/237d6a10ebf012bde95a69aefe37b283/51420383902.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/23008473853.pdfIn PDF document text
    • https://poker-fire.de/file/46083022927.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/81957556009.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/coc60rv82ivc98nmg7ucqb9hh6/jebesivutufize.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e208009dc5e8caf41e189e3e7fa684be/30423507991.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/pigubukoxalorefofen.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/28349818905.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/lanedinezadumafoguzewap.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866d8d9152---zikituzemu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/47419548098.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/najajidasonapixavekonu.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6d600459---78104082519.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/63988626431.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0a00b147584cd6f8dab3bf6b8de36e75/pewesizixejowir.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae560b58e---4914822616.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddbc59a742---favuvubazubose.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3bedd4f7204bddfdefe2db59bc1362de/funukopovu.pdfIn PDF document text
    • http://jarosi.hu/files/file/32392296705.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021826_1294_111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sample+termination+letter+pdfPDF 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_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 17148 bytes
SHA-256: 24ca47190a982080ca06132ea8189868c5a1abccbd892432c48005e50fd5560c
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 10564 bytes
SHA-256: 74318cebc42f2b95b4f591e2038bbeaa987af293450893f2117c4de52d330c86