Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b37b785eaaca58a…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 11:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b01857d0199e70069dd9fa4d1635bfa SHA-1: 9af088f9a9ba47557a1cb75186f85ad6fdb2b0c5 SHA-256: 1b37b785eaaca58a874ca785178ed127f6bd7e9342c8e821e7abeaacc6629179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggest a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=meat+packing+plants PDF link annotation
    • http://monkey-do.net/userfiles/file/83329050133.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1fd7a4ed---zokunagepoxidafunan.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/likadotofagemokexenupez.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1d9a6de7bc5f80c33f648403bc0fc0de/28156361402.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xofopuxofupudarep.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/rexaribu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608167989f050---21467382608.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e860ac48---44663230159.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/nilowolavufixisexadigotuw.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/67664363582.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kovasevujipoxazubodik.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/83548265007.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/46099fca70abd93da48c5765ef55fe99/rojorujibevezevotufuviw.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce85fed143---42668186467.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/10c12cca49127681f44ca121d8efa897/18294544335.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/galovubukavesisilimoburud.pdfIn PDF document text
    • http://planbmedia.hufiles/juzararasizufo.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/jimat.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774046435e3---mimikojonizitikap.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nusukoluwew.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/33969943145.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7a7077f5b4cc6e0df66e65cb58d28bec/pamusutinap.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/b25fc6313bbb197ef4fa64eb319166c3/febasafosuboma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087824ae756a---42736405984.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_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 18064 bytes
SHA-256: 65d2a78f2fad01ce38a5143c037510ab09f09b2e1a705da718dbfb9f0f004c07
font_01_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 10416 bytes
SHA-256: 3daf67992738026ea11d9b30b7cd70d806c55916c95c088c1acc03cd66531650
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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