Malicious PDF — malware analysis report

Static analysis result for SHA-256 6319e5acb63b3a51…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 17:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba605aab0ec8d90f1bd4c3f5f8621fd6 SHA-1: 46646ed53a9caa9c5d8982eedb01ca34ba20f0d0 SHA-256: 6319e5acb63b3a51aff16ed1ccbf698850d3dffc82472952ffbc679820e3207f
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress upload directories. This suggests an attempt to distribute further malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aldurra.ly/images-editeur/img/file/junakirolenijozax.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081317dcb07f---gupenig.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d91b37358---43626246932.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/93496763614.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21962445648.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/nuzepoxujolejuvegi.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nobezawixu.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/remoxu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/luluvikikajebez.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ee7076c59f14e20aa0dceae1d78fe882/xomamujagi.pdfIn PDF document text
    • https://salwangurugram.com/files/34876246880.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/iarvs8ad7sdc3jf2gq0qspl6m3/13343656318.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/26871282172.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb45319e4---pofusupekivukeze.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/fanemikufelopogaz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4a83bfe8d4d947f4bfe8929d11782bfc/36135528296.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/92451900974.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/76092657489.pdfIn PDF document text
    • http://agrion.org/upload/fichier/97611694944.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29bec2bd20---panobu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837a86a4c4---koxeralanarajaf.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/67793347696.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/wigawufoxaxizupigamexip.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/t41hofrcn0cgv0mqs0cs6161j0/zonoraripaxukitidid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cushing+triad%C4%B1+pdfPDF 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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 10656 bytes
SHA-256: 4a5bf461def8c3f216a0ca02022111d96ddee8c339f03d7aa4dc94476feb922f
font_02_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 17520 bytes
SHA-256: d3f54b26d298e472076c803283c9a6424dc0fee51d857427a47325e6c5afee6a

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