Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7327a3d9986a66c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 11:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e7e8166b0faed614355ea8faaad5fe5 SHA-1: 8ad515f4979a45cfed15a072abde5d73c275981d SHA-256: f7327a3d9986a66cc121d60c22b6ac170a8618b7dcaf6263d2d7e609c31f470c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 compromised websites, some of which are hosted on disposable domains or use URL redirection techniques. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, potentially exploiting PDF vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://macphersonproperties.com/clients/876251/File/lesimiwigeba.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/840abee11fc30e4fc86dd6f21fb6e463/20484389087.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/33113581822.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb079cddf4---97139911589.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/67429192180.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/pifadedefo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/97bdef3491af81447b3b77bfd41938dd/wosunujegusufipo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609784907e7a5---67359070987.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/62846972695.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/bafowugotimaruterur.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/40248a808a6d09b93898aa38e6e6bbdf/lojirodesusipurom.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/46432811518.pdfIn PDF document text
    • https://digireg.sk/upload/66266396624.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/8398346648.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3bcdc5ecb---tatumogujop.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/9159351b2ca7997040df452e38075319/fopag.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/61277563941.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pj20r0uetv4op6bs2u3icbapc3/disiladonuloti.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/ligenapukanutixusu.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/mubexi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee14d51ecc---82938734111.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/86501586418.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/oiai14fs34odhl8f7o0et6uflg/romogutajo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/lelogeline.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vestige+agri+products+catalogue+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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 10760 bytes
SHA-256: 12a3e068b6d8cc8108b7a13332b734f2544b688a8bc8dac6e6f1cd266a11ad81
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16796 bytes
SHA-256: e218088a61de6d4269693a428b3f5995498668eeeaf6690b6a454c44be9e4a73

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