Malicious PDF — malware analysis report

Static analysis result for SHA-256 907716f2565df616…

MALICIOUS

PDF

103.9 KB Created: 2021-07-14 01:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 660bc34c6a28f0f735b8a142cd430b45 SHA-1: f2908b435e224837a413b65f4fdb011ae9f4a068 SHA-256: 907716f2565df616b79e0b568303cbc49cca2c61f16a4cf731a60087a6df0a6d
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, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The `wkhtmltopdf` authoring application and the presence of embedded fonts are typical for PDF-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://pistant.ru/uplcv?utm_term=lisbon+currency+to+naira PDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021060511494873499.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609826f7189a6---77868607288.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/suveladiludevutib.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6u9qnu64gr70gjmr57kth2n1j2/wanijaver.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/37014558134.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7e2ab2df---gusovomonex.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6cbde276c---85839664134.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/da2f281b4f2303a61fde640b41e3655c/sixurularasifarelida.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bhehrj6qsqdvegmm2njs299k66/nijulebigome.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uup70k1gut2cfcpq8sluia035l/rimuziga.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/tekuwubasobujino.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/50848375880.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb7c5d8d6---91272764793.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2d72bfa7---73956950012.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c9ac2b51---jegajusufigosa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nopupatetakup.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/gijarewapotupozorukofedo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/wofopazitamolob.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/memezojulorudexava.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e6ff88687a5a7f04533b9ec4a6de57a7/77494315002.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/99777445124.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/xoluzogatamexifu.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/50436034336.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 1696 bytes
SHA-256: 18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98
font_01_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 19176 bytes
SHA-256: a4fb990c2916ea3864d0e40e39292c9b7da5f91d2a9e13bbdccbab4c47577b4a
font_03_sfnt_off0001637e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637E 16224 bytes
SHA-256: 5dc452f2b4f8f6cf50bab96a09d9f243b03113461a4839846761b06a93380fa3
font_04_sfnt_off0001795a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795A 10488 bytes
SHA-256: 0fb77d44ded643e14026ca5a49a3590863348d0f8e9c589195b49461ccc03301

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