Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8e2880b28e4006…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 08:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6104c2e623a5a048bfeaef7e217e9c20 SHA-1: c57876632677d98250c3e63972b4709817437b4f SHA-256: 7f8e2880b28e4006292a7a9967b288b57b1d63f68f10982a72aef7bf4bfc7b2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/zuxiton.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cmbu36re29cuirrunslrctgng1/bojagumamojivem.pdf
    • http://www.polni.si/Images/files/fipusavevezelonuwogefavu.pdf
    • http://quangphong.vn/uploads/image/files/52192026927.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9dqgkjln3d4j272ndrcht8a2c0/zifikutetoruvunakanix.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7dc6857d478d8685c2bb153d74030eee/28847538837.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c01ee52f2abae7a7f22cc707b8d1b459/28360723097.pdf
    • http://edgecs.net/documents/xixagobabojex.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/jenusikimapodigopuwuw.pdf
    • https://sport-jicin.cz/dokumenty/75436209253.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085747189b6b---80341268595.pdf
    • http://abacusnancy.com/userfiles/file/masigenatewibebixu.pdf
    • http://salinasouth.com/clients/11073/File/80797223195.pdf
    • http://everbeenmagnet.com/js/upfiles/files/luxupomitodatagus.pdf
    • https://ottopianos.nl/files/vepuribotanutidupil.pdf
    • http://studiopetrilli.it/userfiles/files/delabumowarogup.pdf
    • http://abwingssuffolk1.com/uploads/files/tabelonukidebor.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e292a34e77---numawunuviwuligi.pdf
    • http://pileshoppen.dk/userfiles/file/vulesazimo.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eb3897c46---vawobozu.pdf
    • https://dolcezzecaffe.it/file/zimamub.pdf
    • http://automotiveenergy.cz/userfiles/file/luneziposimof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=accounting+mcqs+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b79e.bin
23e1be1688ea2e57896ac4f06ac8b23e4426ce64cdcb4315646a9cead7f1fdeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB79E 14592 bytes
font_01_sfnt_off0000dc0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 16792 bytes
font_02_sfnt_off0000f421.bin
c43ca19be7e5e1ddd81eb18417c487a6b000e7645447e8d7e60d330fe7ee13e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 11276 bytes