Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cedf19aa105747…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 23:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1124f03f4f5e29c8c449cf04489ada94 SHA-1: 85af6a271accdc2cbb6a3db13bc8fb7daac91da6 SHA-256: a8cedf19aa105747195eebe696b2b2e2bdc9c9794958a8af6e531b442e8b192c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, directing users to various external websites. The presence of a high ML score and ClamAV detection indicates malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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=topographie+op%C3%A9rationnelle+michel+brabant+pdf PDF link annotation
    • http://gesundezellen.de/neu/userfiles/file/55365067385.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bb4b32373b66e4584113bd0d9da5f5cd/34892839418.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/77713242458.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac514bb2384---kakobapesevupikarisu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5f1l0osuu9k363cn3ec2uqppn2/nedazelewazo.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/32a04d4b006b48b3c8d3cd09afa21d13/94535383321.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/88613855546.pdfIn PDF document text
    • http://afslab.asia/upload/files/29820187044.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/88027313249.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfce60563---25976792407.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a950a12f066---suteputexaf.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/wunagale.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j9dvva395o4gk58e929t2rtpei/garikuvawitelebux.pdfIn PDF document text
    • https://onecre.com/images/content/files/1603501376.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/25d2cfcd67d1ba6ae65a023653a14b3c/lokutiwajaramogu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7650abb5af2a992ffe77dec8ef2e03ee/34941376760.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16102d7142c2bb---92788440620.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4k61vjkbtt6kvio184e44t74k8/dojab.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65cd9dacd---zosipexesaxozutevavugo.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_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 11156 bytes
SHA-256: 9bcd6ad24546c63d74f28b9dc5c0a1ba8df66f9f5488a9601e065d475d6da2c7
font_01_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 20612 bytes
SHA-256: b1a7cd5d74990ff02c75933b730d7db1df797a9e51ba2b6df93ee6aaa78f36a3
font_02_sfnt_off000154dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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