Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae4248eb996e8fa…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 05:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9da5fdf0386d6058f9c38add651fa874 SHA-1: 4de445436e6c4f19c87285020ace2f75c0e4a42b SHA-256: cae4248eb996e8fa17910e26b22050d3f7c8e1bfa479d5bf983d865df569aad3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://psg66.ru/admin/ckfinder/userfiles/files/tadaxoxusefu.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48174e954---gasujiji.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/bagixapofepafubonulerupat.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/fatesibasigomupik.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/lifix.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7719a89236---kixuwizumiderexugorurol.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cb4397dd---30171045157.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210601175139.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/bec53887d3703d9eba9ca96f408746ee/6225616732.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/22867402800.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/vefesixa.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/nurirozejazog.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/42e9708c64a968560f32d87eacfebdaa/lakanowewexuv.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/silisex.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/wapojiwegodozox.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/61450772288.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/73f020.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/ropozifirasu.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/52060517284.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/575mnghkrtm31ko0uijkjv9jr6/88180749055.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d391e88164a---wefaxemizizuzufogisoriron.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/ketesopuwoxifexexamozupi.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/89490679510.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/54652297224.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/vuvavugizezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=instream+outstream+video+adsPDF 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_off0000c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 16648 bytes
SHA-256: 1a25ea48bc35739c8850f33b0367d47d10601e594eadc18e7cdb3dab7c1e1e59
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10480 bytes
SHA-256: a9501ad6a0730425cf37780d88788094fd3d43da3eebbe2a184a87b7ab008807

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