Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0679306e2d6e9c9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 11:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec387f4255c67dd33f1509fdd9040371 SHA-1: ec012da443145cc793d9fc8b321e52d9c0663359 SHA-256: c0679306e2d6e9c9911d70081b4780b85cbe07b24cfef715fecfdf5e97df306b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=cloud+games+pro+apk+download PDF link annotation
    • http://nicolalazzarotto.com/userfiles/files/wasasupi.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/30971248562.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zezuxuwujaxored.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/tezove.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/jakowafi.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/64112128925.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/51705517017.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/vadodexe.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/51917351668.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/wetefasegujetal.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/46166820033.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/46880712611.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090607004373499.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/57036225794.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/66682270586.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/kudezaj.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/fevis.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/zurusibexamogan.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143daf489b32---bepoxejevu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327e29cc0d6---lazalipepisiruzabuf.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/lopiwulewotibal.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bfd0efd9f2a5dd8342ff38529f949647/1947404301.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/39c32f3fa2ace890dd8e30c102ffd167/radeko.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210915230933.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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 18528 bytes
SHA-256: 003ab2c5bea0a6d86ae09f7a8b70c574b5d32b45e0cdc95e67f928c12348d315
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 10852 bytes
SHA-256: 16975c929d452eb30cd082e7a1b7210f12e076289baa698f03c1fddad4b638ba

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