Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d291f038117a7d3…

MALICIOUS

PDF

101.9 KB Created: 2021-09-06 15:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8e97c99ac5e1a9280c82433eaba5e5b SHA-1: 0c0143fc149533f4bfe9c2164fa02c3d6a0ba19a SHA-256: 0d291f038117a7d36037528986b7ee43a8ce883d6fd20e27f065f1950d8d9652
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of an embedded JavaScript stream and numerous external links, many pointing to disposable hosting or compromised CMS upload directories, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be malformed data rather than readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=coledocolitiasis+residual+y+recidivante+definicion+pdf PDF link annotation
    • http://ray-king67reunion.com/clients/41562/File/fifodufupokesilavozovaro.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/83385776276.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c9fe3d7d---25792790886.pdfIn PDF document text
    • http://bscartridge.com/pic/20946926028.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/19871063050.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/zuxidob.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/70241852221.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/99810843439.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/a5b7tec72tl9g5avf81m0q6p59/62657160376.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/61184104260.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13b65c31e---75217077536.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae7f5ba81---bogexu.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/woduwuda.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/33be719c8559e9e35f5fe2dab03ef5e0/11843698300.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/vinenijin.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12730a7b0d---99652679530.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f826eb0e91---60306819665.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16118a9f5b83e4---54017979324.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/renebupedekitafemipogoz.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fb05453ec124e162fda8cffce150594c/dabotedawuseja.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/35520185373.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/zirigutesefuxegutadi.pdfIn PDF document text
    • http://dentherapia.hu/files/file/55715354263.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/39662650522.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/xowojesukip.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_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 19616 bytes
SHA-256: b1f3dff0199a70034b3d69dfd6acac37f7758d067ddbab6e0db1d3afae9d83ac
font_01_sfnt_off00015804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001701b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701B 10924 bytes
SHA-256: 7eeadf62057b701cc167686aae28a1d178b63f976588387b8204b9fdad79d943

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