Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea931d4467ac5e71…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 01:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d8e6b37b1dfd4c9ece5c60949e25b9c SHA-1: fce658122b1c3de2eb79e13997ca51b162407905 SHA-256: ea931d4467ac5e710480adab7b3327aa0d1e8d33bbdce1ce0b26861217b5f576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, embedding numerous URLs that point to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The document's structure and the presence of multiple links to potentially compromised CMS upload directories support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=mixed+pronouns+exercises+with+answers PDF link annotation
    • http://apexibd.com/uploads/fck_uploads/file/delikaxinirakisidiwolo.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd19bf878---kemiku.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1a7098f9b72546834583cecd159084a0/56019608863.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c935eabbd6---tetewuderowuripaxu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0eceb4e1e---47842846320.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f7f18a0824018def34ca64286830e5e3/82581845785.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pajobekemamabejesawi.pdfIn PDF document text
    • https://bloc-immo.com/images/mupekomuz.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b6889b66ba75174c2fdef58828c52418/rirafunumukut.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b7kgodovadstd10q1n78ntjvg8/soxokupolerago.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/8192841517.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nudabofutevewobaje.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/zarakifirekeg.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/mexagefebimesikekit.pdfIn PDF document text
    • http://dgjst.com/upfile/file/defirigazelexuzobe.pdfIn PDF document text
    • http://limoride.net/gallery/file/7604208582.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210714_8553C537060FF986.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/pijaga.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c602ff0550565226df553be31926e42/78856991264.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/52297717858.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/74639950233.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/75785700891.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c93abeb68a67595745109f5d95acc12f/25015141078.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/lopebonimubuvawurawofal.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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 17980 bytes
SHA-256: 0882c59675bdfdce42392d6414fbf102056ed6c0dc5bbe24b0475add339906e0
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 10848 bytes
SHA-256: 7cd577827568c9e4b6578e6221c122b292aa975e6b889c1fc5ccaa7db5eaf3e9

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