Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd424792a17da77b…

MALICIOUS

PDF

99.5 KB Created: 2021-08-17 11:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f542cea12dc42bda39e0aa8d7b785f16 SHA-1: f14171836a07af8aa9b9124fe0895c825d7a71a6 SHA-256: fd424792a17da77be2aa51980a010632c14c50581dc9e17337ce69366d33d5d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.lugashotel.com/data/editorfile/gosatekadisuledimexasone.pdf In PDF document text
    • http://dream-mebel.com/pic/file/45158587632.pdfIn PDF document text
    • http://iphysiology.ru/upload/43128873654.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/49e3b92dfb1958f5c25d537dc6e7d4ae/30371944707.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ad2064956---levelexusofob.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/24690116977.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982bacd6068---29970342022.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/77866d5400a5327c53a0e711c947fdfa/todiniduxolelogikadi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/086d54664f3f914435c372e2d8639abd/rulolalorefisunamomo.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/88958723102.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bc084468---8604969455.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/ximubuzozenafigale.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/b5frhh2soa8vrq694mpdov6vk8/49627507204.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasux.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/38068074065.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/nafem.pdfIn PDF document text
    • https://purefeeling8.com/data/file/renelefufikulipafu.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/20652864112.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/15483877018.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3db52e064---bujiwedaloripuwalof.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4954603b8---ziwoladerenadebot.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd65144fd5---bonidejaxabusuwepo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afac936d25d---vegozupomikazawunopubuk.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jinexexovivekopizejomineb.pdfIn PDF document text
    • https://amblamy.ee/upload/file/68606288045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+crucible+act+3+text+analysis+answersPDF 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_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 17480 bytes
SHA-256: 3e8c18a140f4955b6451204f2f75c3b2b0ff5be73ce6620907c94cf07d2bedd6
font_01_sfnt_off00014d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D08 10884 bytes
SHA-256: 55a4542c9288664039d8a3239b70914e72cf0a2c6a85b9d0a461af325e27ed72
font_02_sfnt_off00016648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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