Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df8460187dff12d…

MALICIOUS

PDF

94.5 KB Created: 2021-07-24 17:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a594b4303fba222a7d07ddddf6ee88b SHA-1: 91f757912a9081ee3f942587ab844c29a7dbf4a1 SHA-256: 0df8460187dff12ddb146b7626efd179118070a5896b0e9567ac4dc99e65c3e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9afef810---37304646758.pdf In PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/gixodiropadumagidof.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6c3af5e53f16abd3fd8ea48a235579bf/14191416793.pdfIn PDF document text
    • https://retta-bg.com/userfiles/gebaxifujafizi.pdfIn PDF document text
    • http://praguetransfer.com/files/file/tobodixuripamezuvofo.pdfIn PDF document text
    • http://santabruna.cl/upload/file/kojukixubanozoroba.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a15f58a6a---62541603092.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gnb9h35lijftm0d93vnqdd3d00/89681190869.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714565a4888---7771350924.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abc972bb068---89896072213.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/xuxudazelirumuwa.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/17657581186.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/gulex.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/be3939561b99613d8d669293460ccfd7/siruzod.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2fb2spp7iqf4if70qkigd2l2q4/42595831718.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/91848240569.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c195878775---26976135865.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qlmda1ro9mm1b36v4udi2as6gr/22320909065.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc75112d55---42330891824.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/topajesidomugufokokesilum.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/aemu2vn0tl7uuch1n8mb1j5sfl/vugogo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3ef47726---49193937218.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/koroxuros.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2601eabec684c52eec21f377fd75b146/66691065670.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/8168569660.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b402c843---75936660448.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/81285591331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=attestation+simplifi%C3%A9e+des+particuliers+employeurs+pole+emploi+pdfPDF 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_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 19252 bytes
SHA-256: b9bbab093e82f9aef9000f1af2e246de7649487db051f38bc5c490c28ab08f4f
font_01_sfnt_off00013630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E47 11132 bytes
SHA-256: 86a37529f9a9966f52ca936a1762da25371c83c5745bd67f8b61a1d52c964a1f