Malicious PDF — malware analysis report

Static analysis result for SHA-256 064d8ffea51b1be8…

MALICIOUS

PDF

88.4 KB Created: 2021-07-30 02:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c02a090cfcecdb2ad72e8ad47440c00d SHA-1: 72ef816f63426b9f2893b852cbdbf621e3bcb653 SHA-256: 064d8ffea51b1be8eec194240f4fa12a5365a2816dbea28d72bae8290c67fbdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains or compromised CMS uploads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://martonelektro.hu/files/file/zenise.pdf In PDF document text
    • http://cloverpark1959.com/clients/51168/File/76666839466.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/46262949468.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/gejoxuroxekelevu.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/40887520163.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/renepejagofizifi.pdfIn PDF document text
    • http://platcometals.com/images/file/kumoximikutoraxis.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/67978197699.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/509q8rh5u3i2k8rrj9mduanquo/saneb.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dt41anhevn4r20h4le784d11js/16144863592.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63859b987d---rufolofuvatupizojenenot.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3c6686f0aeca0c83d9b39e2a62ee2f6a/35533348906.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210628_BF299444EC73CB47.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/rovogepufexoxesedimibeda.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/womin.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/repupawojasul.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/wilenujad.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///51866037911.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05030cbf5d---28485504682.pdfIn PDF document text
    • http://mopron.ru/upload/files/mudawibalizabejorurakota.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fdcbd9045---kevobeximonakigok.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/60217253591.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vigitonozujanurof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3433919119---vowogafot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ya%C5%9Fl%C4%B1+adam+ve+deniz+kitab%C4%B1+indirPDF 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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 19912 bytes
SHA-256: 221206410dfa197cda74eefc88a3f0d96e74eaf9ca2176b44a548fc19d03eab6
font_01_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 10752 bytes
SHA-256: fab1636c0f4073427bd5475b8fc58130bb3a47ec943057945fafdf1016124636
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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