Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb36cec92079769…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 13:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58f27df1f745193819da442eee2c7ba1 SHA-1: e01efeaca3af7997a5d7864ac343305bdffe0572 SHA-256: 1eb36cec920797692c8ec52ffa1aba70a69272cc679189c78751ded9332cfc6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The primary function appears to be directing users to potentially malicious websites, likely for phishing or malware distribution.

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://philabc.ru/uplcv?utm_term=stalker+iptv+premium+apk PDF link annotation
    • http://servmed.net/userfiles/file/wozidizevelam.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/2789155388.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wogoni.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/8650046888.pdfIn PDF document text
    • http://oilbasaro.com/web/images/ckfinder/files/20210909023243.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef77e6b1---tosinorotuvigi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0a8fb6c1374170284efb81a392261566/44601188627.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e85f5bb74---biromizarosonetebopes.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/41476509021.pdfIn PDF document text
    • http://uhorder.com/upload/files/putugixigejore.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/zuwowejodedajas.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/beguvapemovejoliwowitubin.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/54909678299.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140871268cc4---risifulolos.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/zuxenizaku.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/na77j34agk1fd2gdkghra9eqp1/gowuladat.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/48546596880.pdfIn PDF document text
    • http://hibertek.com/image/files/20210910_220359.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16317301699873.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/fuwiliv.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/74824487211.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/21280956646.pdfIn PDF document text
    • http://freeski.hu/freeski/file/50450349187.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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 18312 bytes
SHA-256: c4a4587fe58e5eaeaf6a5c4f4126c5391110f12396e025ccd466f4d59dde07cc
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 10356 bytes
SHA-256: fa9f41f83f1f31f4067ac7d27a219125275c327f2430b64c671d9f8e1e337b6d

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