Malicious PDF — malware analysis report

Static analysis result for SHA-256 15441f050f87cd40…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 20:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4942ca6b77b75111e12db53eb2a3592 SHA-1: 76e08b1e28df592cb30cc1e51f0b7b8ec6db3b48 SHA-256: 15441f050f87cd40f315bbc3c660df9ef20e745a5a79d7315caddedb49ead070
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=words+that+start+with+w+and+end+with+n PDF link annotation
    • http://cioccolatogallucci.it/userfiles/file/fitapufuse.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/gaxomubozu.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/13157389287.pdfIn PDF document text
    • http://tianfonmm.com/d/files/73796423560.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6f109b18---sivifetanuboxoxeresiwo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ceb51ae1c---15263868656.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nixaretazexomuwifo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dfe50d4e9b5408c9b68b5d26c1662f76/tovuvovon.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/91956464907.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/xemitarerim.pdfIn PDF document text
    • http://proart.by/media/file/gokababosagivogojokuxa.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/jeguwexutivutetadevos.pdfIn PDF document text
    • http://krzeptowski.pl/file/21777642509.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xixaxe.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/jimisadi.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/konuvebovaxajisul.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc165f810---gidoribabasejifizemute.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ae6306e3---dujozu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614220d3c34ee---19907578150.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144d9ef0b61f---botebipavazipa.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/2667885739.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xikemade.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/metosijinipiti.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_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 10380 bytes
SHA-256: 10bb2469aea51c99353ef6929721343332d0c5cabde55d5ea93de8ad858516e1
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 18048 bytes
SHA-256: 9c39b1995de61f73d69c27b6323dac66e78e123771b89e64e16c751d097cd004
font_02_sfnt_off000112ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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