Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e8a9cc1bc5acf4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 22:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f34666585964e5bcd35ea9724a3b43b5 SHA-1: c75a7b76e0c28b2697d86524c89bdcc7af8b424e SHA-256: d7e8a9cc1bc5acf4a7e1fbced47f6dc190b3c45222446df127e76c32ab0b473e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://ketchas.ru/uplcv?utm_term=pokemon+journeys+episode+1 PDF link annotation
    • http://idealthailand.com/file_media/file_image/file/wizamenidenigumeradog.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/morofagurajusiw.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/92862381184.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/tofugibiximotabu.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/80828173434.pdfIn PDF document text
    • https://resicolor.com/upload/files/6320896475.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/tulededik.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0qb5oafiqpldelq7p5tfgbuaos/4107643721.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/83410544097.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/tavuwugelemaxobasemozito.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/70upll5vfd4pd4uh0bh28lnn24/dejumavekofabizepax.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/wimekunu.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/linobiba.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613549c4ea832---xufesibeduresulokenamo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/33442049087.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/zowetobulirafovozela.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/76151982655.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/baluxasonoxujiziges.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/xolusi.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/ninetisosopowesaze.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/wupelemukelobotube.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/63116689199.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/71135921345.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3ab82567234e90efa5c1969a53c3563e/bisenajazemaromifi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133171282584---33328531492.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebfeebdee---54355688411.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/forowukimif.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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10736 bytes
SHA-256: eefdc221aaa095a7666408eafdca8c159b1b63fc5fa0d349e6128d31bae69a84
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 18196 bytes
SHA-256: cf83aad7815533987b01f78161b0471cc6deab8e37e38cd54ee91cb303e89f68

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