Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f3e5c7d0b5a053…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 14:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5cb0be79c6c6ecc23bed1a9bf8d64d1 SHA-1: f87946ae36ce3c67d9fe673c75bb0a8c28c4a520 SHA-256: a9f3e5c7d0b5a0531a01754c84c115db5b3d2818f3ca6f1d84ce46199477f3fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external URIs, many hosted on compromised or disposable domains, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=numeros+naturales+cardinales+y+ordinales+pdf PDF link annotation
    • http://www.alcera.ca/userfiles/file/jokinipixa.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/rutududiripujutanafur.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/didezifusexadoxi.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aed8b031ae5b7d5c93142fe863e435b2/51761176844.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/26303432574.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/80299185952.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/66131081268.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/46917733211.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/sokej.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/82761082083.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/kebefituxeluruvunukulip.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210609034530.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/namadatesizetizasi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/abeb64ebcd7916c28d4731eebcf29e2a/raxuvufazatagosijubo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/10a017d0960165478cabc0f427f051b7/xixezepapamaki.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/33015307292.pdfIn PDF document text
    • http://i-dron.cz/data/file/72723637114.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/rogufufefedob.pdfIn PDF document text
    • http://vning.net/filespath/files/20210819051845.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/nudamebuzazifaminidizavux.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/fegobepederitawu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b5ccda95d2b902a896b8426fad00d97/41409868557.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d22cb1c4660---37664787775.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_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10972 bytes
SHA-256: 9833a962efb293ed41cf6f815cff6b5090cb47f8d95e2a48f6c5d595c21d5666
font_02_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 20040 bytes
SHA-256: ab8af3ee7e909cfe610d393e5a0fc2931e421f1db0dba178a8c3a6cd58a3de67

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