Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd851582e01eaf…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 18:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b60ff7b8f424920da87fdd07644c6829 SHA-1: 9f57c49f86c32cb32b786d08b250716cb31722a9 SHA-256: 25fd851582e01eaf90e8212e97a6da68f4f4fbad5f2da64765680ff76fa09074
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, with several heuristics indicating these are compromised CMS uploads or disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, consistent with a phishing or malware distribution lure. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://seasonsblinds.com/uploads/ckfinder/userfiles/files/zulubodupaluxogoje.pdf In PDF document text
    • https://landi-bg.com/images/file/75006460567.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/13915566163.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/vugimawurijafomela.pdfIn PDF document text
    • https://anaksemut.com/contents//files/jelifisi.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/vawozibuzupenole.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/lobelupire.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jekuvoxepagalog.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/78690526890.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/pazuluti.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607285aa13ed5---17692112292.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/pobipavolofoma.pdfIn PDF document text
    • http://bjjiffy.com/upload/75853760461.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/76a37b46b2f98e1fb48760ca84ed66fa/wuwupalur.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9127c23e---6546772585.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/vifagegokajatabesafu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d7qnkcnsnnh5msiadmru4epfm2/57787078173.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb2b02713---tazeleve.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/xokolimufonifujanezaza.pdfIn PDF document text
    • http://uci.ir/userfiles/file/faxiruwezedabeguri.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/fhgjtsnbisfa81edlrdbbd7e46/60897410278.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88159701328.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6o8evguk7m9vpgkmrumi4l2khi/sevutuvisegapitunopiladu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0732885a---kutidopofetolipof.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/zuxifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+giver+chapter+22+summaryPDF 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_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 10916 bytes
SHA-256: 7bdf388a8bfebd1c0f6295af2f2d8d7269d93fd1c3de5400a3d520c5e58d2989
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 16852 bytes
SHA-256: 1f12f2d75e243bfc078db25af05b874d72e0bfb6fe0f22f93bd44cbaea9d9799