Malicious PDF — malware analysis report

Static analysis result for SHA-256 d688bf469c08c4ae…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 02:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5786e84d703610d6ecf546f23469a5ac SHA-1: e3bece618c5260320d0328d8ad60419cef03d026 SHA-256: d688bf469c08c4aeb1fbc32fb27d75e0fedcb3a9943710d91d3673b92a4f055d
164 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. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The 'SE_INVOICE_LURE' heuristic further indicates that the document's content is intended to deceive users into clicking these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=adoption+papers+pdf+california PDF link annotation
    • http://obrienbuilders.com/userfiles/file/89340802967.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286c0d644a---41774401171.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/18098915496.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/65719176619.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zemafidujovuw.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/gumerek.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/9567071367.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/34575623309.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/589kpmoh73mgt0eioo0pvhd5i1/vopagakixadowunakazogosi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4ebd672d---lusigalivafulipoga.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/de4b5e6ce197427e78ef74cd2a362bbd/bojefasazijaxo.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///gozivagoxuvejetixigoforot.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/21717637038.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/xomuda.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/856qfhlureokgt4iua4ppe0do2/72718179265.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/45286265060.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/j07hmvoacoa2mv7trabkrj2og4/wapife.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/59009404264.pdfIn PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/89523392400.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/dodovojaxamaredobuzalu.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/37009872121.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tron4qdibi2on1683s0j6f6q7b/39987282940.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/teroduvake.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5483cb66---53392011068.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o0pdce5ugoq4v9lll6jlnmbnsa/39874581566.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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 10596 bytes
SHA-256: fad2c300fec991d384085779459ecbb5bb3a5dd41733520c594abe9018ab67ec
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 17416 bytes
SHA-256: 409bbda7a7709555c1ce4b7cb58fcf02ef6f4bb619ec7cea1f4c2599f43b1a1b

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