Malicious PDF — malware analysis report

Static analysis result for SHA-256 018f8e1cf8e3d872…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 23:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c806e6d4ffc2c16f57f0bbf86e01377b SHA-1: 088d54d1281cb278807e0fcbb462cb91e8261d2e SHA-256: 018f8e1cf8e3d87294bed80b924ffa672d0330703d01cc9aec87403cc0c8d3fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure that redirects users to download further malicious content.

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://laborke.ru/uplcv?utm_term=business+management+notes+pdf+free+download PDF link annotation
    • http://sinoorchids.com/image/file/97392584928.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/44701b33a1ceee1bc354ecffb1399978/13826305742.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/josutogadugedotuv.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/zanipipofatixaj.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c051d7d39---28441573025.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/ferowosimubakakuxoxut.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0755954b0---93459086464.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beae0650b9---7236159439.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb419ada7bc---zepunepet.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/radomugobeso.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/46483866036.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xelozobepom.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ir98hu2hg26t3voem3r2p94gul/jumumodukapebo.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/zisanofusojizoxulasujime.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/65382567792.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/sakilatikebivetenafewo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/175a381ffc85d4679c871f0350fe3e11/19063164744.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7c73d1915---fefagexezaduxuxopag.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/disonufip.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/16605175636.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2fb19c2c819973e76c03098591675ffb/58816294174.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/16458723600.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/96c75b98dd1a0cae07fb66cde617a750/15851232187.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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 11080 bytes
SHA-256: 474de407e546cdec8bc2ee87755f9724df04d80f9ec1153d4ae6239f74582c21
font_01_sfnt_off0000cf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 17032 bytes
SHA-256: 98ea26e532cb0c9a149a2007b13825a5b5a9cd4eea38bca645219632731178b1
font_02_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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