Malicious PDF — malware analysis report

Static analysis result for SHA-256 846b56d61995bc4e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 23:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ac58ba13a5dd57026007a553e8d088f SHA-1: b6b158bd41d5b80d37dcda4153b8eaa0ba8b92cc SHA-256: 846b56d61995bc4e0709497fbb8c1d3e7354cb9900ead5ed6e7ebda62901e7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=mewatch+on+android+tv PDF link annotation
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/52b7e1e0e5d498370ff90f040c587002/17112089896.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/joxawoparavu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135db1928e64---43713503807.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/98482836727.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/48441132208.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/musuvavowavonalifol.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/gatekubalamive.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/15747595250.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4a3b0751---pobexetazofunujutukamixe.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/sivewixotoferonamiza.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/kidowixisisoxi.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/nisavemefameme.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109100453047709.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/715fd0259e3ddcb435655a6db04c0618/15487759665.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xurotorexafezojefer.pdfIn PDF document text
    • http://lachina.cn/upload/file/nejibubab.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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 10396 bytes
SHA-256: bef59a4347bd7d05059fac71ceaae1b602147a8e644dea3aed2909b8420a863b
font_02_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 18588 bytes
SHA-256: 240411f73624ee7a3d2fa9e28e3d38bfaa8ea2c38af5c5c08a9de4d8e840fb60

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