Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c10e9ff8b615adb…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 03:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 401db4be2aeea0c59a2b78e1aba0ef95 SHA-1: 324323d31f3d0692052560c68101d952f81a7406 SHA-256: 3c10e9ff8b615adbb60ee297a7b610f1335062e19b8b2ebdc357932a455e9e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other unknown hosts. These links are likely intended to lure users to malicious sites for further exploitation.

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://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f232ca84e46---7070305480.pdf In PDF document text
    • http://keramann.ru/uploads/files/83537540120.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/76856260966.pdfIn PDF document text
    • https://12shio2.com/contents//files/lujizuwan.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/wawefavetenulupiwufomatan.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/12273792834.pdfIn PDF document text
    • http://alkanboya.com/files/file///48495466569.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc816da3f2---taluzawadamajafojetuzusok.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a55541cbd---44981366784.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7308bbd6a1239594a903d651b100813d/28894773571.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/ziroretevonugozijagad.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/58484179561.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161274195f31ba---kojaxobuvomeb.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c5f8b6f18e82029abae0a6c9a45f0417/kixibirusoxoresa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc06bd3ce9---7310968591.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b0eb6edb---tafosisuloguxinu.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/35403010715.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d6f01037---23542297799.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3f07c642a56ba3e1777d412874254892/pejiwupazera.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ef36cc734eb47f53d3eea04d8802a86a/82547709363.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/14379221794.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/84261735049.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a08fd46c4a0e096db2f7a995439e54d8/45180261151.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mplikoev37k67li6oaq5nccpeq/14561375967.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcced6512---fafeximutapinuvub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=raised+bumps+on+back+of+tonguePDF 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_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 17660 bytes
SHA-256: 1cda4f4485025268ec1f06361b10595c0cdbd9ad535dab6219c24c2113a6ecef
font_02_sfnt_off0001438e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438E 11192 bytes
SHA-256: abb71650abf02747bb27f56b71a2ab9e978cfe854d05ff711dccf942ca1ba179