Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4a373cdeebd001…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 17:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd9e9dbb5ff7fee8e63beef902569ffa SHA-1: e7391c993803dc8c232eb2ddf14123fa8b34112d SHA-256: 6b4a373cdeebd0015a27959347b24ebdb1a705aec035a4dcc93b1b09872f83fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

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 https://philabc.ru/uplcv?utm_term=free+printable+worksheets+short+vowel+sounds PDF link annotation
    • http://stomerijindex.nl/images/uploads/kalujilagudixuvan.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/80ee146ccd33f18211528109b9555cd1/notilapuladi.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/mivakaxebegizetuxajirilip.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/gujed.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/57305838478.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bmvla0i0m7tb5ea8ng3fkrojdf/kuzawivik.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sazesekanojubadunawixir.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/49996906549.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4461345d---kewamadezaregutan.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210803091217.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/rijidokigutulip.pdfIn PDF document text
    • http://hainfelderteich.at/gakowalamonimi.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/karefoxukibuvoxeledu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f50c878f74d2c741a1719973558fd9d7/71786857331.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/5865728278.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/sibajobibujatadaf.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6ad3596d2135c5025e6104fcccc95bd9/fuguwovevogipikoniwofixus.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/88848738427.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/93478039338.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/7873684659.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098b36321dd9---31709784197.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613245308f195---donefimoruxuwimezowulo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/tafimojovuwijasewos.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1595bea12---vemiwuzagatatifuwo.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_off0000b70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70F 10952 bytes
SHA-256: d910e84e89e7eb5d4bf01373a8f7572ade8ae298685b72b16cff4caea54eb7c9
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 15032 bytes
SHA-256: a9cb04bfc6548422effc2051d04c772e3724d2986784e6b2cafbc6f61b36f999

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