Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2eb821ded45f0e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 23:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96ac9b86a17e90869de1b0ab4f7a2848 SHA-1: a53d24b6824a9b410af82d5e6e7758abb0ebbb5e SHA-256: eb2eb821ded45f0e76655e96e3ebce285d1e880f33779de06be213a384f3c34f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and is flagged as a link farm, with many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement with lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=windows+8+pro+product+key+free PDF link annotation
    • http://tahyuh.com/uploads/files/202109171903313694.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109140632111566.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bfa93417---gebujonemupoloduwipazo.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/45487814250.pdfIn PDF document text
    • http://e-hematologica.com/users/file/34764855267.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210908113512843472.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/70977328433.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/19189992651.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/68448976131.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210918023029.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1451519031f0d0949aaaff8a57f3d8d3/lejenagamuloraxizut.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/tapulalexiwujovuvupaju.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/58142082174.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/fezupegabulina.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/66190757748.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7d133d81d9492cd4053a8d62c2a48c65/zejetasuv.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/25298754862.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc432b6415---nalazopugurarago.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/43498200028.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/30018366031.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/26815877854.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/33232247698.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/15538739950.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/gekesijokipijijesofuzixan.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_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 10996 bytes
SHA-256: b96c9a16037b1e164549eb735a532a63dadbf09f83f1d47b9c53cbb799095052
font_01_sfnt_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 15420 bytes
SHA-256: 46cb7c3df0186c61c4e7274e498fe64dcf1c584d88232a09032997b95ba018ce
font_02_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1