Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e1b21460367642…

MALICIOUS

PDF

83.1 KB Created: 2021-08-31 19:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 254ad7e3c542a9ad8dbb8082b77b8c82 SHA-1: 5a7200c3507dc298e9e93058b94f5d2b65c73a1c SHA-256: d9e1b21460367642e72f72e7c65fe57bcd3c0b3b24f0c17654da64d990529ce9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=wide+data+to+long+data+in+r PDF link annotation
    • http://bscsaoner.in/ckfinder/userfiles/files/masinipaguxutadafal.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c053a528d---duzovusasujizexudopexakek.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bc6d887f---15412811125.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/guzubakijenaxulesusa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/14895467e26efa0f6d2c5c995e538337/miripib.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3kr8um8ktset4l79ddh4861510/xajinipi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c0bbb928---zoseradanomiwifuxilu.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/zedomapave.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/ketivonexotaketajidufo.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/48236840364.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-29/20210629105634178607.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/wagafiradidajamowa.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/5631486199.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a512a7e7624---jerosezafebubasirig.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sagafojibezijujolafovef.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca42b07fcf6---33625884362.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2ea9a9e4---24125467789.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0de83423e11e2ba2501b6e789d7298cc/boneruluxunafug.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/93007178113.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/nonisawizoleb.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f60b93db5c---dulalorobatijenowidunavif.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/48951757092.pdfIn PDF document text
    • https://ckmandarin.com/uploads/tizovomovusifunimano.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160740075c8cb8---wasifetuzotewexix.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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 17668 bytes
SHA-256: ec37b7301ab155a3b6af7e9fc601ed83e05e10f13c698c12936c44eefec85405
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 10248 bytes
SHA-256: 42332fe48d870fa69f76598d8d0b779124c1eb39ebdf94821fd1962978e795a8

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