Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f66df25ea6425a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 18:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1c587dd7ef0d567b61d97f67c43e44a SHA-1: 159cebdad2d4349865dfe54afa2001b068281b57 SHA-256: 74f66df25ea6425a657b88d6e29222f37a5afdda392f46c8465b7b7e4ec5ac21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://otczenacts.com/media/files/kupirokabutavepuputow.pdf In PDF document text
    • https://viettrungson.com/media//Files/murefapupefefotovepovar.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/dokevasukebaxi.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/wimibusavixirin.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/vagubixabagutujuru.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/9b454e4a011bc2f9b3ee0a043f7914eb/96372442194.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c116a95991---20168687393.pdfIn PDF document text
    • https://la-klamm.org/Files/files/losadusekonerasevetol.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/65246913803.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/754e28d8aeb18806ede14b8d5357a912/78683352972.pdfIn PDF document text
    • http://espwireless.net/uploads/file/xodizutev.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/sovetepunoti.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/welit.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd25779d988efc43d2b01de6c0422e16/xujovezutolitujikikizomub.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/19944049737.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/jezetekesepebali.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130653f4d3a0---rajimosigulapafivusiv.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a025c6f23cf---fojubos.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3bd2c0e6---91237558134.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/67052532354.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/491d538e72dfa8a592c4540bc0236e83/rikatevufemugowamozijiwo.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/vowifur.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/deduw.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/zowoguduxozezedukuvipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bsc+maths+question+papers+1st+year+2017+pdfPDF 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_off0000d2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 11596 bytes
SHA-256: 0378d56fac193b10925191d700d9b2262b50f78ad536457138ae89bef8fff5eb
font_02_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 21692 bytes
SHA-256: 9f1c9c548589864e0ba9b28684a3da45ddb18908581e1855c3308d15205068ba

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