Malicious PDF — malware analysis report

Static analysis result for SHA-256 458790b327b6e4cf…

MALICIOUS

PDF

80.1 KB Created: 2021-06-28 18:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 42f1052d1a97e5f1c28f3cfd2dc76c82 SHA-1: 7a4dd1ef7b1835228cdfa31e1198bd3a179165ef SHA-256: 458790b327b6e4cf236441aa3130ad6613132d90955ffea16f8ecaf9b1b39cca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The primary attack pattern involves directing users to external URLs, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://wastran.ru/uplcv?utm_term=how+to+become+filthy+stinking+rich+through+network+marketing+pdf PDF link annotation
    • http://scuderieverdina.it/scuderia/userfiles/file/10640753783.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/35f6ef1a2889dda66681a5f3d6be8dd4/fanipubomuxexube.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gql84pcffo1dtk4d6lav3ua2pm/77622534545.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/7062995317.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/boworodiramikiga.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8109a0bb---dujogitasow.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v7p3lo6s5t0r11ha565qh0pp97/14971317482.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/74063689562.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c508e55198---72717899347.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/70564065229.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sapafetenogerojolaz.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kediwafebinug.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084344db451e---90235800078.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3813f6bf---kogirasojotijetetazu.pdfIn PDF document text
    • http://german-ex.com/1596474829.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/xenokix.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/osor3eqnbrbr3io0lfmunh32p2/saviwefuwodidimupapate.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a41eb22a872---kopajapexuwipumosiji.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96f2d2940---ruvajonolofexaluko.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/kijiluvajovi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/20888894cee1de5a14b8f8bf2c1fa449/kenetomozubem.pdfIn PDF document text
    • http://polkovnik.su/upload/file/58907173067.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3524b1f9ab3631e7a170e791cce74661/xuvozigoses.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/tuvawowasosabi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d448baaceb6---fijeporabokejix.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/370c60b9522b157f2b0ff6f528b8edde/rivati.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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 11592 bytes
SHA-256: 594f26394854165e12954579ac83e17eec98f3a161983e58b55455dae351bc41
font_02_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 17596 bytes
SHA-256: 79b3a56cd6dff9fcf8bc8a1594d88f565754ed69ec55fff0b33ec591280c01a4