Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e52772294148c3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 09:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97305044c29e7496dd676d5e8ceabbea SHA-1: ddc5ab9a21e929771dbbaf652d826ead2cea38f5 SHA-256: 27e52772294148c3fed1e42009a19ab99c3c2e2ae21417cdfcd77845245ebdc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=vade+mecum+kin%C3%A9+pdf PDF link annotation
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6a7240b4c65e3fd7b0e29017d24a6e40/54373267483.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/nakasisalej.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749700735cc---jaxudabikaxuwamun.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7cb76026456b16e9613c174e43362ae5/50108515486.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o385pmsm9uamu1okegpil045br/musik.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/17457722211.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/98239880172.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/galuv.pdfIn PDF document text
    • http://dsagco.com/Upload/file/pimalijutawasuludapefovap.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/kimodutexafavulaketeza.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/gagegijafapepujo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8295b57a6---10519545179.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/27a4be5df17554b5b627495fca8b815f/diluviniwotivugu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c674fe7c41a---pisikivetafutuworimi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9bbed1ae---suvopepotegogudesuvez.pdfIn PDF document text
    • http://gysanya.com/upload/file/21081419063065456681fji8zhd5wc.pdfIn PDF document text
    • http://ewtch.com/upload/files/weser.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942c4a8ef78---tumabepopilodimoruso.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/7828380242.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3fdc91fa---26122732718.pdfIn PDF document text
    • http://masonhn.com/d/files/mutojetanuron.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xitewone.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/nasexi.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/48212232715.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9dc04f7ec546d6b37af48378f27d137d/loritanotozibedibaz.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_off0000bf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 10564 bytes
SHA-256: bab2b76925d1290e9f9d8b3639e85b024fec2135e0121d7cd6632eb3549b4f5a
font_01_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 17916 bytes
SHA-256: 4ef061016b1d0ce106c0266d0641f22ee7d458e24317cd4964b975ccd6bebcff
font_02_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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