Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dee80fd3d694fc3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 15:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ad2c77fd63ccbce1f4f1279b146dbaa SHA-1: 3f6714c8bba92a140aad6db46a08180eaa905191 SHA-256: 8dee80fd3d694fc32a009c61c2d65e8e96ff358423d69b7177bff145a9922225
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the nature of the embedded links strongly indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cl-metalparts.com/d/files/legajijanivulexenevev.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hhveupllodb59a7av5onkodqb3/47899213413.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f215d2ab---farexilipafarotuvuvosur.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/vifeg.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vapuvefawivejupetutolob.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3816282890c599441935f62be99c266a/36950310880.pdfIn PDF document text
    • http://zae.me/datafiles/file/1337252812.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/51191994009.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6137ff63---35461428970.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/pujodukabulesobowege.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c047ec1b0fc---logarinoli.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6c65ef0ce775abbebff54a7741354302/rogepu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ramuvuj.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/zuxavugiduxowevulunevile.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/75538151642.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kuludob.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/zojajanuverusepijokelopo.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/sozitipupefulijiw.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/12662463583.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca74d4df0e5---figuvowebulurinave.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/04cd4b03004bb383b5aae07499597143/dizofediwemabusavijup.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8fafa7b1a47fae54e0d465bc85dcf09e/43010650895.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/93364620546.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/45704706126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=big+sex+drive+meaningPDF 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_off0000bc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 15116 bytes
SHA-256: a8f2252ddb183800095f6c9158b8ae7563dafe28a473a91f787b97a27452f0d4
font_02_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10548 bytes
SHA-256: ea67272acc8756f09303e35efe99501c2407b44cdac20d3ca1b247a9386eac28

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