Malicious PDF — malware analysis report

Static analysis result for SHA-256 882711b9f7bd82ee…

MALICIOUS

PDF

90.2 KB Created: 2021-09-09 18:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e34cea7e5149fab9c9539220dfa0dbc4 SHA-1: e487570808795f6ebac5771de236ff58888642b8 SHA-256: 882711b9f7bd82eeb8a71cc44c212847390705d80a2b658c3893df4645fbb663
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The embedded JavaScript stream and the nature of the link farm suggest this document is part of a phishing or malware distribution chain, likely intended to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6a2fdb0fab71f8512c6dabd13c5272c7/vopuza.pdf In PDF document text
    • http://otvorene-srdce.sk/userfiles/file/dinemakunat.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d2c7110fc25603fc222daf8e2679fac2/pifurikofemegujawek.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613561d24c37a---18802844938.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/tutab.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/93475578084.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9e9be38e---linanu.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/59619760032.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/9255007138.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/19995198612.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/94416192868.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/mepisa.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/xetibixivovovikudagoxifij.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/3884825066.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/75590646318.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/21346675286.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9mau0v4do4s965q8vgsho09qgr/tivitamepakutivon.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/efc21b8bb16c2eae73b2365c650482be/vapenekejozalusitebem.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nuzikoroxi.pdfIn PDF document text
    • https://businesslife.com/content/files/jakazevasos.pdfIn PDF document text
    • http://chinalabware.es/d/files/bokenapoxesimipevuzoxilal.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/75976897794.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/felusenoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=software+to+play+android+games+on+pcPDF 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_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 11240 bytes
SHA-256: de7a0236396a4f3386637e502f45e1a06a8e3ec754cde81bcbf6298590d02442
font_02_sfnt_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 18656 bytes
SHA-256: 5fd218f435ab715319a315cf5c743ed11741075ec153cc8346ab0d3713f26199

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