Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57cd96c81339808…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 02:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e13fcc9d7e0c9c9cee051a1e9b4a25f7 SHA-1: a4c10011549c886e5ac9145e73cfc0a6b531f1c4 SHA-256: f57cd96c8133980882140a548e77fdf888e90b8e77248ea247c4cca1b4c71b1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS uploads. The primary function appears to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://nhasachthunam.com/upload/files/nudetom.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae11ab8859---gilofivanam.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/44480470762.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/valafogepogibo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387991b176f---pomesukune.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/17766191716.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/74514654060.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/madufawepiwuraxukov.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/wawaxawipuwojubo.pdfIn PDF document text
    • http://cobmedia.hu/include/lazilepikok.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a564642138b8f015925ade817680e7f3/novowavekifekajorexow.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/suxifubifetoxewezuwidome.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/1853871580.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/mubirimesifu.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/62914136199.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/42377851038.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/41542652116.pdfIn PDF document text
    • https://ienter.bg/files/57077626555.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/50820915160.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/putedaxadubezad.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/86703092471.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/bibujegovakirizigudazazi.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/80931385322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=8+ball+cheatsPDF link annotation
    • 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_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 10160 bytes
SHA-256: 9977d32ad9a25b6491636f48c4780dc32fcc28d362374b77799362e926a9e25f
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 18496 bytes
SHA-256: 76889f00fc82ba4f0539519480279689b1e2c731279d40c46a2e00a4c584b208
font_02_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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