Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bb87634ba2237a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 18:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6956f4768d8023d28ae78001c1c9721 SHA-1: e4fdfbbb1bf1810db7568869b1017a036dbda3ad SHA-256: 75bb87634ba2237a53e0e8d843029ebd9d1826e669e0446051c1cb4157f04067
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, likely to redirect users to malicious content or phishing pages. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3477

Heuristics 6

  • 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
  • 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://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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