Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2feb1c720691ea…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 21:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 938784b9e524092b3bd0514237e2c509 SHA-1: 4b6428be74911f6efcde513228cbe3074dffed14 SHA-256: fe2feb1c720691eaa662a71dc77e01e515be5544d64a343d9eeb7d85761ec1dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://partnercable.hu/files/tilizuvesabofero.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rk1nt919lpi1ddv556k5u7vnoo/11668889902.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/33469825814.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/77269189659.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/tosonep.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kofoludo.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/41308077228.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/vinifubelebage.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/xevupomifupodor.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/91267a6ea51df3db60a03cc45fb4b4da/kapujuzisolode.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/55857017541.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4be43ae5c1---88179289509.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87307107625.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/63056016658.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mbh1ltiltofh3l1q61ku0kfppo/mujasupub.pdfIn PDF document text
    • http://schokozentrale.de/idata/52723552689.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/46621039972.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zokefojok.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8330cdde72e54a661acacd18c5732311/91409443522.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/modugidetumefev.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52c53aa36---nobidaso.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/88062254781.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/jasumujosido.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/80858886090.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/43608729878.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/jexifif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=greensleeves+partitura+violino+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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 19292 bytes
SHA-256: eedd80bf518c6bcbc01f3ea374b0fb396e636e426e32401dc1d78b698c0e2db8
font_01_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 10696 bytes
SHA-256: ef5d5d8b18abf5205124b4be2fcaaafc57066c107d9291edd6aef68a473cfdc1

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