Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f05d1f577095615…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 20:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4350abf6e16938999be7ae1a760bcc3 SHA-1: e80a8dbe7551e16f53dba6ba109078760238d8fc SHA-256: 3f05d1f577095615900a179e5121fd3a56b579799d420ada5543bf561154802f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=godly+man+book+pdf PDF link annotation
    • http://backkwang.com/userData/board/file/joledawolumizozanupaf.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f764a3e5c4---xitowosakozoverumusefado.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a053f86d6f4---vimasalifitobodukovix.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ltf6dbtjodo9qmsejee6j85so1/vukiwezo.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/97371779841.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161155e2f8667d---vunipawedematufule.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210630_A3C04ABB7B085A6F.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/rigeviwuposul.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d531648cf5---buwinizisodarup.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4b98b6af4b3056ffe309cd54ea9c16b8/65544827050.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/76ag7l2b52imqlu404pcet4s3v/30337984374.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/77989753104.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/606243ebf846c544e6cd70991a1029ca/80258006166.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/joralomupidizajam.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ffbe229b681c04e98ecff71cf4ff5f5d/98491310444.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/50481383993.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/16675983854.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4aae9042be5d9227fcf2b3da1d8d2e0f/rezijiruxiwazafi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608326426026a---widujibag.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/31604819361.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210906_024946.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105db4a27d9f---pudevo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e941e20e7a---35588769477.pdfIn PDF document text
    • http://imoroz.by/upload/file/lufefawadujemis.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_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 18036 bytes
SHA-256: 18dbb334a4e0a73bdd34853ab3ff99450d07bf83fa02df6605a5d9a40b946bcd
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10456 bytes
SHA-256: f28ea0ad1e4a07526529d6250763ec87a19bbda99db63a7833e1ab7c1715dfbe
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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