Malicious PDF — malware analysis report

Static analysis result for SHA-256 93836e3ed984d96d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 14:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 300cdb39dce6fa219ccb2675bc429073 SHA-1: ce030180d821138d60b234e7ea3e3d16c4885eae SHA-256: 93836e3ed984d96dde62f5139f763df375967e237a18b4f0fe24f8b6c279ecb7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates an attempt to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nhhs78.org/clients/63854/File/lamafisefumofag.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6cfceb4403---duvozodigimupijoxazogur.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/912418768737d99dfeca002a2e86591a/nupodim.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/68429435201.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/jigefelebejibedini.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/jaxokusapavanuxejexixire.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/97d0cf97a434299cfd90aaaee2a85aa3/sonino.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/vamesom.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/91708625923.pdfIn PDF document text
    • https://anakmeong.com/contents//files/47219458196.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/ribipivekunuzevetivawuvi.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/66686788070.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/vuwunusafip.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160722db018369---pawepevukobovigamowumupik.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/34676180351.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/5208559508.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/41429878777.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/gipoxitadesafamogimede.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/crf3c36983iv860ub7b8084l8p/52919815343.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/cd5ad81df3d00c0dc77c6bf132495271/xajuviwitanepivid.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e9d842b7---2933432553.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/vajobawojexaba.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/14863226443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=export+pdf+to+power+pointPDF 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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 17400 bytes
SHA-256: 9c597c9de2c7a781af2a05d82567d799bb10c73ae2049371e801ee6e1c3eac78
font_01_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 10288 bytes
SHA-256: 6852e1f544e06821587fa7a2e214ea41edc59543fe1106f5a43004740ee50920
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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