Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9c20b591127f0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 20:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4da527c435a2859ab6135369af2680c SHA-1: 8f05cc9901d8cf9fc3cb5d6104401a4d31cbc40f SHA-256: c9a9c20b591127f0bd6fd20bb2331c07bc3e71259c9b970c624a81357a08c012
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised websites, likely intended to redirect users to download malicious payloads or engage in phishing activities. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=baseball+9+download+apk PDF link annotation
    • http://altelaw.com/uploads/image/file/pebafukuwesexule.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef08044267---gilemimadulemozorabukef.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446db73a773---ziwetaje.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/bedilonofo.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/90460662707.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913035813.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/komafetagapimewofak.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/89942674337.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/10320339429.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6c0efd69---24830103005.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/dilodudidevimagerel.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/59684226646.pdfIn PDF document text
    • http://e-district.org/userfiles/file/15337413038.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/fogogasalujavebegile.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/lurozarajisiri.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/kigulegagijaxunenetoga.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/91004210717.pdfIn PDF document text
    • http://wirheiraten.de/images/file/68046777020.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/senovifazufokopof.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/15502849998.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/54894160366.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xolaxutokewe.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/22360973227.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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 18572 bytes
SHA-256: cc725f7279900901c9ba076dab59c7bc2a2203497068914e408d447d4faf1998
font_01_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 10632 bytes
SHA-256: 10496d419327206b185f338fd6547c919199395907a6505d5d9e4eb354f9af17
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1