Malicious PDF — malware analysis report

Static analysis result for SHA-256 b321a64428338f08…

MALICIOUS

PDF

85.5 KB Created: 2021-07-21 10:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 097c99b4ed4221dcb2869f99bbaa6974 SHA-1: fc29415372c98bb89005493aabef604cc71ab810 SHA-256: b321a64428338f08e5442c34e65dd79451d410ef416ffc39b98f79a8bae28ff4
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 a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The document functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites, suggesting a phishing or redirection attempt. The presence of multiple external links and the nature of the hosting indicate a potential for further malicious activity or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/dokivorezurenuzuvobi.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608341778621b---kebutikodagib.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/b98a0a9fb311dd054cb2bc53dad9f8f4/86820080987.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee27f1b60e---bijevavagibufezafujun.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j0rvkf277ivs7vhoahoqtqhjj4/81849705465.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/48123806053.pdfIn PDF document text
    • http://bronia.org/userfiles/file/53321981794.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ranapara.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/79584847091.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///dakawisirizalozawez.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e01f20fce---jovobepumedoralameloxuru.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/fopap.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/o5ms4odu0jn4elj063i9crqcs1/rolaredebepuniv.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620dc0549e---98228738405.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9c72f5cc---90155368193.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/mofojomexodododa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0emn2nd9cdmngc0b7moauo4n56/guwezokuxonudere.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/91702914824.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab8b550f7---83369294960.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/dowopuk.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/67913549727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=red+lump+in+lower+eyelidPDF 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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 17320 bytes
SHA-256: 702da55d60b7e1293a0063ebffd3ed01f2bf1ffbce627bb18b43727e67c9bc2e
font_01_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 10468 bytes
SHA-256: cd838865709bd5c5ea1709af856099aeb30465cae1a7a0f7f6f50e5a571c3b8d
font_02_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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