Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fbef3f30dd0794…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 13:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a7ed51d72b261fcf7e405550f78485a SHA-1: 6fa0e1313bc8e270521f0799dcc9cd5f464c4670 SHA-256: 29fbef3f30dd07947c19cc0e30618f22f83c7077abec214503e100d5827a545b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=how+to+find+ip+address+of+wifi+in+android PDF link annotation
    • http://madiagranitosilano.it/userfiles/files/gotoxurubajexawovinivaki.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/supivizafuzopo.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210910202243.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/darulilutomuwobuparavi.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/603878199.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/46410064985.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/duzuzetibewofuw.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f79d8214797fe8f6a6b615db2cd89195/9441125329.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/todola.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902190301605342.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/voxirivirek.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e86660b02---56305956575.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/57790787525.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/30729123288.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/toxunasetetago.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/60764756889.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/votevigepu.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/88987893015.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efabb52714---wasomadifuguxozoda.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/palefam.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/54319336300.pdfIn PDF document text
    • http://sjhtractor.com/d/files/jowezopevuvozisozi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613251e102108---pulukemixogutekoxizopo.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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 10520 bytes
SHA-256: 682f0af0a5736fcc6bd3ec00174c0e259d2d3e6de178bf0e71447f731f43f92e
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 17368 bytes
SHA-256: f0d9a5a5f8d124b699083415ee3a602e7ed2d2c7f490ee48e7b710e85b71b7f8