Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e70b1fdee582b2…

MALICIOUS

PDF

79.1 KB Created: 2021-10-12 00:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b254d049df2cc98215ba7d55407695c6 SHA-1: e5f66044e0d9aca4cad1bc7f6847ac5e0087fbbf SHA-256: b7e70b1fdee582b2898c82f0b3a668362620433fe8b1af06b8ecf9c02334c7a9
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=identifying+subject+and+predicate+in+questions PDF link annotation
    • http://tattooindex.nl/images/uploads/24112581633.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/22198221365.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210908214519.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/88181397690.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b2a0f75154---13820479909.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/batarupe.pdfIn PDF document text
    • http://annabarons.lv/files/files/30284061591.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/punizagosu.pdfIn PDF document text
    • https://cf2019.codefon.hu/js/ckfinder/userfiles/files/rijujusamukixiv.pdfIn PDF document text
    • http://banquat.com/userfiles/files/32207887134.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/49623644547.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210918161635.pdfIn PDF document text
    • http://tapuionoticias.com/ckfinder/files/vetobuxibilorakikekolawew.pdfIn PDF document text
    • https://priscar.com/documents/files/tilav.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/zagozerebaxig.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/vujon.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/35496123708.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a28fe78ac---xokakir.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/28341460379.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b62a6e2d168069423689e2b964d5058a/kobikakodanuriwagogek.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/79708329539.pdfIn PDF document text
    • http://htwy.com/upload/file/23363079983.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/vavidenajademunutavubimin.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/46738325848.pdfIn PDF document text
    • http://clingac.es/d/files/29725940538.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_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 11328 bytes
SHA-256: b38f4046f6b19a43ca8b06cdeec022d22fcc177ebeb34a50b86caebdc8127002
font_02_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 19024 bytes
SHA-256: 1fb2bebe70ed1fafb9b4777ae4d6e8d8a8fe97382a8195f8dce915d224b9ca8b

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