Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b880dd8ace1e55…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 06:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38b041aa74a1f7f1f6ac1b86a5a6e707 SHA-1: 60dcce421a8b6f51fc826bae95260ebdc67b0431 SHA-256: 09b880dd8ace1e5546d01f93277ae7a02dac3bae4ba4ba19d6469477c5dfcd87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of links pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL analysis strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916cf599a1c---xavoxirukusume.pdf In PDF document text
    • http://omegapizza.net/uploads/files/nenemirojepevudosamozutu.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/1916379815.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a346411a45c---texus.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/jdou22ift38nrf85t8mb3is34i/fifasamixemufozonagupono.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7261529e33---pelol.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9c773e620b75584a7fe4bf394c62a775/wokejekozewekala.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/12731134979.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7963771fb---13977620936.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611542e02090a---41424430608.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d2b2225b---47548285926.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/43204856444.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/43149699527.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/438b9ffeb3633eee6947dc4e96a5b4d5/88175101440.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/69262244358.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc77ebd4---12546408982.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608166c809ec0---55780082287.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/pojaruvelulavobe.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/5449692470.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/rusuroboxivoravukugivajet.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/denavema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=photochemical+reaction+definitionPDF 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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 18084 bytes
SHA-256: 6b26639df408ff0732a43a5c56757c99036f4351575a639e289b12597c7ff5ed
font_02_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 10576 bytes
SHA-256: db467d75561662c6e6d817a350f93e7ecd098dd0340dea26c71675131e95b0ba

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