Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9085d67c4c4ccd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 13:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4776d0f02b937f76da9fde62917eb539 SHA-1: 98e3bdd0eefe6305e657d86aef41e9b26e6702ef SHA-256: 3f9085d67c4c4ccd41eb78e38080f4d895ae61c3cb66b748e5aa761a014d43ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are characteristic of a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=trinity+college+hillel PDF link annotation
    • http://surmounttravel.com/userfiles/files/89116048905.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ec8fa5044---75707748099.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/gusoravuxarage.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/9c34531264f091b4682d62c83c66ea74/30914366501.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/77396930231.pdfIn PDF document text
    • https://anfauglir.com/images/file/34665683913.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/remobivomigakawinupe.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/53350159371.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/sotedabefasalanapelej.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2418101b0e5dd72f0cfdb65b64dd2eda/sozolimasogosofenozisases.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce90a053d---wavuwapil.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f597bd932---pabeguguxi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/34570547777.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/fasevekidesajelaxebuxa.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///rudulun.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed11ba8df23---livifilugogunizedaniz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/mumijapirotureto.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a5ddad8a1f0dcd0d5f4a535ed18f6aff/48284243882.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/dotewaduloruzogakisu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e95ottfm7gjfticceqq3veceup/rigeb.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf80d03ea98---remizenirenimodelipe.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/65453297556.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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10256 bytes
SHA-256: f734215dd61edb1a1274c4660d186b745087d309242bd0ed6ce3c119a5246eee
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 18356 bytes
SHA-256: 7c142e5b3642c823223f457f08243a81aa9e44dd0e3fc947c1816c4d3e052b91
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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