Malicious PDF — malware analysis report

Static analysis result for SHA-256 425258ce8d60053c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 11:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc215bd84a0dcd96a0894811b1ec0303 SHA-1: f4941c002f41c353503b2eb7e177ac75ba854767 SHA-256: 425258ce8d60053ca459c8e8e58e61f0f5f414c6dd53b179d595d2af864e931c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm directing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple external links and the high risk score strongly suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=customer+satisfaction+marketing+project+pdf PDF link annotation
    • http://holidayservicemarsala.it/userfiles/files/89250640542.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/ca54267fc623914184956146ecdd2da5/zapevonuzoferijuloja.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946e2d1280---30261123963.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/jusujatuzuwoduwari.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/53733683358.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/38788387635.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/73183479994.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202108310912232455.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e71babb32---jilavezepukun.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/5336366893.pdfIn PDF document text
    • https://onecre.com/images/content/files/gelidofesajorozerajigif.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/93435653693.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b23faa33bda40d10c33a2b541691a9fe/75827574850.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/88627422956.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b1b258e2---11295308161.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2f3ad3eb150a41007341157f8737aa30/neboxeguguroboweker.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/reneniwofiwomilisig.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff4c91e57---begafa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c4380a23---bozamabilurepulutitolix.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad374bee8---gidajejarinorisiz.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea58e354b---75391582850.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d03389dfc8---vizulupojiwolamanoveginer.pdfIn PDF document text
    • http://sinoorchids.com/image/file/79876719769.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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 18012 bytes
SHA-256: 3df5eafab26b9530dd5c87e4f0d0c096cbf2d15b349dfb530ce0576f79b37a5a
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 11272 bytes
SHA-256: e44e6c6ff71a70461638f16c852f2bec4ea8dd3ed5f0ec8aeacd498cd1621413

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