Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee52418ce0b32fe6…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 14:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33d9c8da34532723705b1eedc5323286 SHA-1: 5ed2fc8dc70e22229f69eb38dab7e9b68f6c409a SHA-256: ee52418ce0b32fe6ba01bc6a56ab5f8a792612342c4fb0a73a15a230b96166c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=new+york+times+magazine+pdf+free+download+2019 PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16121d968239ce---69646370483.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/13/busuluvogitorowuma.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612b2dfaa8438---22614869796.pdfIn PDF document text
    • https://jss-moms.si/upload/File/bawatapevejotopuluwed.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/zuduz.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/74551416679.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/46125460278.pdfIn PDF document text
    • http://mega.kz/media/upload/files/59303406268.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/kaxexejemasosedozekesela.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/41082189637.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/23333912405.pdfIn PDF document text
    • https://cargotavio.ru/files/file/duzimegotixawul.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/87092679830.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/28068993778.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a881b7658b---kisufarosirake.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2e4k5hir4lsfha2k062ps3nlsj/35363416597.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/taxegobojopegulogur.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/najopedunuvi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6146c40321---fujuxojisavitutelixivif.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e9bddfbfc1b6fa886bf6970e0ae4b3a3/kalamesidonap.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/12546024674.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210714_1C862A5584F3F39F.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6h1melp1u6nc5cprt5lhcn9g4b/logebotunozovugaparugopiz.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/57079907526.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/81960309863.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/dodl43idpcrb4nbdofrchk84p2/pusimulafiwal.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_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 17392 bytes
SHA-256: ff2b67c8413160dd6e889631838d3664146df26272b99516d619f5f9a035dffc
font_02_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 11632 bytes
SHA-256: 1ddd692111b79630bae915374029120118c2ebfd29762441a30520fde5c6fc95

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