Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faedc0f43fbe6a3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 01:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e6af5092035d72a940a8925b3a83c43 SHA-1: 795ac39630e92f9e75f03a20d19f606d2b55a45a SHA-256: 1faedc0f43fbe6a31b9b45fcf06fa453f3969bd628a3bd3fd21bbd95ffcc6de4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=menschen+b1+kursbuch+pdf+%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF PDF link annotation
    • http://highendschmiede.de/highendfiles/file/62695401198.pdfIn PDF document text
    • http://www.moyekolodin.com/files/11576792827.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/99329595615.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3f0b78e9---90957776591.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/kozexogobe.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/porulimadalux.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/milodiradoj.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/35638860052.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/50626024251.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/denonuxuwi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b486499d433---sujidedenu.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/62703991599.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0459ad2bf98afeba20fbba7bd1799280/99643521625.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b8c7aaa58223cfba696e332d778eb3f7/romepajimivezuseludotu.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/bekelejifubij.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b30267f0cf6aeb642290437cd5229667/18433131555.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f5336450---wizodevuxaruzonebevisok.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/43531430451.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/35805131449.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/be08328c915002df3dbf80f18b724943/47217387461.pdfIn PDF document text
    • http://geose.ru/userfiles/file/83955090288.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/pixinonipi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 10576 bytes
SHA-256: 8bfd249d8148bb64324cc91e9cdc19a8e4d3f83927469c8224637fd5cbb1dc92
font_01_sfnt_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 17208 bytes
SHA-256: 6be1ed53ed35952afa8cf363273ef0e21d7253fd42250511edb339f001295c9a
font_02_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 19660 bytes
SHA-256: 274cfc454d0f50110b9b0ad564eaed8f5c61bc377dc9a0afd05bed640a115900
font_03_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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