Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fdc31b3543751d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 01:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6a3c78e7f41949a500c1adcd4e655c0 SHA-1: caeeb3389733a30737334c702409cab97b26c01d SHA-256: 21fdc31b3543751dfbcae4d6ec2600757a62e6d5419f55bf2dc0a5beff5fb47f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://jwconsult2005.com/file_media/file_image/file/lunizebazepadesadiwon.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cq0o9vhd82h9a26lu4bhlqd24g/zukazurusupedajeruvef.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/xulav.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/82682511388.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112a47ad92e3---67244124026.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/80737016516.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/52ee8ccafe03351041a7bec0f99db1fc/kojewalomibuwotoge.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/jezig.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c86533ab64af47de98ccbb923388a6eb/xogogizelonome.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/wusozaxanaludubelubugaboz.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/bef32e3b2557e87a37ef5638ef304a8e/22176156993.pdfIn PDF document text
    • http://budka39.ru/files/pamek.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bf9qi7d8fni5ib164cneia2e44/gapumonodirumidala.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/rolugegapakonadex.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/3100381999.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/62585967363.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd847eb2019---serefodopir.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/16488801965.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210811201331.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc6d83042b---sasovaxavopitifatuw.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/22658961686.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/5406a45039429549ef0915aecb71b7eb/90205290409.pdfIn PDF document text
    • http://ruresept.ru/files/file/36122971636.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/34712274777.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/kilawazafazudanejidaw.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/fuwifodugabigudovib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=iron+and+steel+making+process+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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 11004 bytes
SHA-256: 7d62c16d44f1ce236d343c71a09f689abb7d8938707e99275ebb295d951009f7
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 17000 bytes
SHA-256: ddf710ccf3444ce865993f1f414f8c02dd6c21e20b43efd53a3708df30d8568e
font_02_sfnt_off0001243a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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