Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a3f4739c1c01f…

MALICIOUS

PDF

90.6 KB Created: 2021-09-02 00:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d4d4386d234223c5d572b05d536ba52 SHA-1: d641b626bc24a19a83e0ebf79be69eef11874189 SHA-256: d39a3f4739c1c01f2c723bea8677872ef648d53210834bc4c6870a6dff76a92e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used to host phishing pages or distribute malware. The presence of these links suggests the document is intended to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=diversity+statement+job+application+example PDF link annotation
    • http://oikoscoccatoarchitettura.com/userfiles/files/39204463020.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/85127b4db2cddefd930ba318bf626186/mepezuneduxupelizusamezun.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/87a55970965a8adef60c9c45c7825127/99550688994.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/10345454000.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/20478365722.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7ba80b53d70444b6b7c2867a7c0b1af0/kiviraxejiroxape.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4730268c5e945f20ad4e4d3f07357aca/lixufogavo.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/51977324132.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/us77qv5cjttsr4u4h8caneptv2/52822700667.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/63679248031.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/61198624179.pdfIn PDF document text
    • http://abnicum.com/files/file/jumaxor.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3344a21e---beluvakap.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/mugarezexudepim.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/72472860418.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/mivajit.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/gefilulerasariloxepem.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084ae8f2a8---gelezusetaxisomudadi.pdfIn PDF document text
    • https://somogyplusz.hu/files/84642222401.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611118233c598---46317089188.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ed3287b31---37101054404.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3b88b7b138478b0c9750cedb014ccb1c/29112637890.pdfIn PDF document text
    • http://z500.si/files/zujaragugujifuziguwavax.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/14340299605.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b92ea2115704849e09a557a1da880611/bukaretobik.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_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 18372 bytes
SHA-256: 520147a0d3c52458f7c647c875c579b9d9cdc8b9ccb314d93fb0b1c36db397c0
font_02_sfnt_off00014178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14178 11088 bytes
SHA-256: 4435a5b199eb30eec0c880d329efaccc9cab6f67ad06f03479d89300ac25b08e

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