Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf804089a9f3f22…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 18:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39db44418c3f4acbbadeec9ee5be6edf SHA-1: 9434b6c4ca81b3a16b040dd21b479ef486585a91 SHA-256: 2bf804089a9f3f22e9c5616b0a6d6ff88c918d0a9abb87b469a89aa05ab8f68e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript, while not fully decipherable due to obfuscation, is a common vector for further exploitation.

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 http://zbigniewrodak.pl/galeria/file/nipovikelapepani.pdf In PDF document text
    • https://lanegarrett.net/userfiles/file/80478180602.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/bewenado.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/duzokiputetopixanonedoz.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/2627787476.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/39012426754.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/jigozuxopototima.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157e2cb9a5---41980677783.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/polumidogakulotivosur.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/55726232405.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/25467252752.pdfIn PDF document text
    • http://youil.org/userData/board/file/tanelojajatasodaxojo.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22760517752.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/86096378999.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbec2df15---4734396196.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/39593347672.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/74919563872.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/90098002264.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e5g28dif587mrgvv1iv0s9mv07/92394170037.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/runupavodoxenomuri.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/dovepewanetuxizasuvu.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/garovofugavibu.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/73021160161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=faa+9a+general+handbook+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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 10796 bytes
SHA-256: 26e31b1eb9815b91eeff5bc7cdf15f1ff715e7bf27b535d65833499214e4c6f8
font_01_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 17812 bytes
SHA-256: f75af9dcd4a670488c38bf1e48ab86ba7adf23146e8a9bf96660c1b7f3cff68e
font_02_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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