Malicious PDF — malware analysis report

Static analysis result for SHA-256 508fa21bf421d4d0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 08:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68a41ea4312eb3d799ac1226ea0b1029 SHA-1: e9092dd84ceed884832e5118a65ed1ef1b172254 SHA-256: 508fa21bf421d4d00fb5f21246e1711e703313b116b3d82480b0c64e800e2a96
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or other unknown domains. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a44606b3c1---94693258551.pdf In PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/79042427823.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/78471183140.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jogoxavero.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/japofawumoduxisesiviraj.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbc57be78---guxunimejazaliliwibimawov.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210915141135_611547.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/sanonevi.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/lofiwu.pdfIn PDF document text
    • https://tebra.si/userfiles/file/18861595862.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/llhsr12tfi860mooa7r78r7n7f/74956855211.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210909195311.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/59442190567.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/92c7f145265f74b2a811f2c7594ff71b/34615956807.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/41023118377.pdfIn PDF document text
    • http://infoguard.ru/content/file/pusuxirososim.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614517c59a929---wajetunuma.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/656008070.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/5289460914.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/xeloposufimog.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/vubumefudivululegexal.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ad088319---xafazuwitixonewurisazuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hack+golf+king+world+tourPDF 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_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 10620 bytes
SHA-256: dcff8e22f0a609268645f2fa1ba73595c4e47a9664ed231d730ea4e865485613
font_01_sfnt_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 17436 bytes
SHA-256: 3581b7a48282728160ab15a91edc50ff33da6db39e5b075221d95eb1c15c966b
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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