Malicious PDF — malware analysis report

Static analysis result for SHA-256 617f53c86c3a05ed…

MALICIOUS

PDF

108.3 KB Created: 2021-08-16 22:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58c50723f3c4763652ab35475521a993 SHA-1: f2697348f3c8ca1ed2acb7b88c2bf4c617bc59d5 SHA-256: 617f53c86c3a05ed0dbbb3f6461b4300debc1930e7a1fd830d088dc3baf040c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of external URIs and link farm heuristics strongly suggests a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=aziz+nesin+t%C3%BCm+eserleri+pdf PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33780b0c95---74185485521.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cf8d942688fb2b59b84ff094c29740a9/96693852935.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/159f5d5cb691adcdb0183c00e966ba1f/zotuvu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed62fca206---guwufakijawi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a65f1d9f82---kuwonugafokeza.pdfIn PDF document text
    • http://sun-tes.ru/files/file/dozuniwukonuf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160832f6d33767---dotevukixureg.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/pokonadavamu.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452fc3675a---sogekoxozakir.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04d078e44---furepirogamajevupujas.pdfIn PDF document text
    • http://mastervin.ru/files/file/59743490642.pdfIn PDF document text
    • https://kede.org/userfiles/file/89241922495.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/demakijag.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/17143912335.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03adae828d---podexeju.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/xuwakenefibijebedujisatup.pdfIn PDF document text
    • http://absigorta.com/E/file/67648774606.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/87970790877.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vhqs3b2vdc0bf3tiu3dnud9lk2/36179960574.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5297e33ed9db3deee7ff6c37c95c9d97/kedalopuroxitaxufijor.pdfIn PDF document text
    • http://ducnhua.com/upload/files/71090463503.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/e251062f96f2b4c111146907ca530cb1/demejufaj.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/47ocip54d3cqgqmkrrh1oo59ec/jakagel.pdfIn PDF document text
    • http://apsons.eu/files/file/90917574601.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/jugakavi.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_off00014353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14353 10612 bytes
SHA-256: ecc857214ac97f2bbca12e267f1ef77d86c1ab3f6eb40bb503fd4e090e140832
font_01_sfnt_off00015b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7C 19036 bytes
SHA-256: ea29b6adc6c9c01f12e0e8972381286f2aa66f5575eac6fcbcd789f6ced627ae
font_02_sfnt_off00018984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1