Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f34177f45e2d877…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 03:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e061355d7bb296a3afaccda6f1757fc9 SHA-1: d5bb18cb7d326f15e778278a5d28ccbf9184c1d9 SHA-256: 9f34177f45e2d8777b19fcccdcefef51c5cf94b18b213841514458fe13e0b740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The presence of embedded JavaScript further suggests malicious intent, likely to execute further malicious actions or redirect the user. The ML classifier and ClamAV detection strongly indicate maliciousness.

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://queure.ru/uplcv?utm_term=check+my+power+supply+wattage PDF link annotation
    • http://sk-massimo.com/js/upload/files/tazopofudubozatumosog.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/kupifapogawofotosax.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/51069244559.pdfIn PDF document text
    • http://guitarenko.fr/img/files/gekoromutudifabaku.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96942c5f2---7052522260.pdfIn PDF document text
    • http://forti.in/userfiles/file/ranakofonuso.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/t6r8eoj2i88ojguc7d9572tog0/zomagadixewezakelilatov.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/9609870399.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/33133036612.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/72364698773.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/64055537173.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/wudibajuvirova.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/64374784377.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/21793634274.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o2vdrligr9p4ub4bi25okompt1/rogevoz.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/niwuvowixovulasujimimo.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/sejovidapi.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/wozemi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee9c4fc1d---61551486724.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/jakenul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755ec89554---34101333109.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/resukaliwemojulotagaronax.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/51108811262.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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 16868 bytes
SHA-256: 617c7890c9bbced5ab729c0d4f741febee398751d615156a8bb9b5be0e9b98aa
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 11048 bytes
SHA-256: 6cc958e5f8d731a4650b5241685b50c5e1d9a5b94b0261f7133e12420c8368a3
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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