Malicious PDF — malware analysis report

Static analysis result for SHA-256 358168fb7c90a6b7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 17:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 419aa14d75de5ecb2fe917cd5ae1cfdd SHA-1: bc11790925119828710cde552e4ff97f2aff36c0 SHA-256: 358168fb7c90a6b7719f67e746e66ce702b6203686bcc6a7a35a7c1189d55648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=dual+space+pro+apk+64+bit PDF link annotation
    • http://electriccityusa.com/images/fck_uploads/file/89536572477.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/1320139921.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/rixoxul.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/laruwopowufiw.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136620f82b26---64995922850.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xefumimalusinanu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/49678220476.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361be097aa2---ronufarotanevenezaxazo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c9e1bcbf---putuvuwarek.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d3a0b6c75077257e9ace059a37fd8d4e/11095290885.pdfIn PDF document text
    • https://cargobull.cz/res/file/tawuxuwinutop.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a1800dfb42cb2111ae1517d1a0e303d/linaluxo.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/14565102206.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/pinuzulobujewixe.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f088938a5b---16674532441.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/33132818579.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/99130117107.pdfIn PDF document text
    • http://jfe.hk/userfiles/6860912246.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/98091184891.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/46554289475.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137307312045---demadim.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/63079570454.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_off0000bd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 16300 bytes
SHA-256: 4490c5f07e576b466f8d3755a53e26991ffd0e9291b402a0035e16dd88e19526
font_01_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 10844 bytes
SHA-256: f0162d41ed13404903a1bb99890f1334f3a3afbd063d73fc6b10e95d0d16635e

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