Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb6816b8206898e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 12:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f32beded558ac16034629817a2f86f6 SHA-1: 2e21bad1986dbf23fc8e4763bf807b83817a23e0 SHA-256: 3cb6816b8206898efe05e24a20add8e8419aa4ef72d2d7e3c705e58ba2ddd5e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 various PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure-based approach to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=pokemon+xy+zip+download PDF link annotation
    • https://avflash.nl/upload/files/sosoxemafonivilibegi.pdfIn PDF document text
    • http://iccarrentals.com/files/file/dukibarusukolekezaweja.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba12c63877---11272637012.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/nemixe.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/2322076113.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/80514992387.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/vokuduxefotabo.pdfIn PDF document text
    • http://nenorm.com/files/files/25166109989.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/xeburo.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/nevolidideninigezata.pdfIn PDF document text
    • http://cocoal.com/uploads/file/87894174715.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913022411.pdfIn PDF document text
    • http://trieuduong.com/images/Download/41642994477.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/pitazofopegilexigowowegim.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf0cdba80---jekaxevadebokejeviwid.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/tidutidiwofitupup.pdfIn PDF document text
    • http://warehousetraining.ie/images/1089570540.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d9ae4bbf---lutijonekin.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/zanikasedakovozen.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/70332902884.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c4069c2d38a5531e25d8db3e347f9f1a/19613790793.pdfIn PDF document text
    • http://kdekdyjak.cz/data/pimebepa.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/94488309381.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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 10640 bytes
SHA-256: 1a13a7cdb7906b6a185fa553f1dccde16828b5698d50fa4e57fe81d477206aaa
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 18272 bytes
SHA-256: 50d075c8de550ecdf0d78f068628e8e74a4052ac38ac52ac038b695147ea57ca

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