Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1931b21ae50f58…

MALICIOUS

PDF

97.1 KB Created: 2021-08-08 16:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2846ab791dcb6f1b64ee5f96a8fdd9fe SHA-1: cb67eb177155676d9bccfcdd7440424274676c3f SHA-256: cb1931b21ae50f586fcc6cc71fa406450d31ff0c8428061b3fb9aa397625b30e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=reddit+wallstreetbets+cciv PDF link annotation
    • http://zabradli-znerezu.cz/userfiles/file/roxafizunakuwero.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/rogetadojojekarowukuna.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/25096756972.pdfIn PDF document text
    • http://ozari-ua.com/files/file/81364862816.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/53954280106.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176ae31f31---rozexezirebimewuvil.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/zutetifezewerimopowed.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/jifime.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///joguzoxefiru.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8ecd6ba11bbe10fda54f24c0bdf33d59/95650514093.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/difuliv.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6340e5cc---rerez.pdfIn PDF document text
    • http://www.siposferenc.hu/html/46375720555.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/936ddc6b509412dc676b2e69ad5ac9ce/35847981489.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1f590c0a4b1e3aea1cd5d617f38f289d/jozujutuxixudazez.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6abe5a12---tekogemujadiduze.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/88982060385.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/besivetovixax.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rh8auq5572o8jnsne1ailagei1/jejalokejatebuxeseseputej.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/tubivuzowofa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4fc4fb7bcd4bffb4fa3cf14812f22cee/gujizedofobarava.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_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 10476 bytes
SHA-256: 9c866ed0b74282dfe04893c85e6843f0b551602a71b594794610de313cd2a8a0
font_01_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 17928 bytes
SHA-256: 7764fc33faed54c0b9f17f03291671049a30ac390e0b60fdcde1e8e7d51a7bc4
font_02_sfnt_off00015dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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