Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53bd007d8c8c1e…

MALICIOUS

PDF

83.2 KB Created: 2021-07-01 00:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 05dcdd932af611cb011b5273414aece0 SHA-1: 26b6b781b3c61092a87be37af218b3ab6374d9f9 SHA-256: 4c53bd007d8c8c1e952e352acbbc57fe175602da36796d0a079bb9d7e9276407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=base+pay+2020+military PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e3127416---43706866289.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c94d1a581---xupodasafadukasisedogaga.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7565a5895fa3bdc108490c6b1a08d0cf/20803822200.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/gemidoxupuwosokafileju.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085824ae39a0---kegekupasemi.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/sekumunosar.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/40862366287.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/pulatisaxixobuneravoralik.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ec97ec150e8ca0d90470b73e56e162c0/52447370096.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e44e23ec64673b9fa925cea66373f23/zenovisa.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/wexigokebuga.pdfIn PDF document text
    • http://kgmda.com/upload/files/41107386697.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/savijajejovitid.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n609tglqpqf6ckejfjqmh23511/76617068752.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/a16824b98d081178983a6001c252eea7/tagidigusidujaputin.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b63f09365---bifun.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5616_20210606075038.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/32237523600.pdfIn PDF document text
    • http://zae.me/datafiles/file/lejaxuzokavo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mebozonu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb59499501---tunorurapewelelusujezurig.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ac3e1d8b2b0bc2e7f1dac5824c210822/jobikesoduzukej.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/vufinoraziweserido.pdfIn PDF document text
    • 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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 10596 bytes
SHA-256: b532457099d785171463d988f6e382ddefce5301c58dec2015e6ac4a12aef2bd
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16640 bytes
SHA-256: 8acfdceb39acb4736b027745472ffa8873f4b95405f0ab1ccbb2f20faf1afe7c
font_02_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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