Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5261de96170d422…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 13:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69c481e8a8936ca5319b26ea9e129bd0 SHA-1: 8e68059bba4bf6b8d13c1ae86a653ce690833412 SHA-256: f5261de96170d4222c61806aeb812839005bc494740c9e849bb8140fc99f3300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external URIs and the ML classification indicate a high likelihood of this document being used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://eltdb.com/UserFiles/files/67787550643.pdf In PDF document text
    • https://clubon.top/uploads/files/72975036079.pdfIn PDF document text
    • http://charontrade.hu/data/file/fagazudemomumusegarat.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/36483377887.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aca4b05f8---47987134484.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/5ae613d7d72ab0fea30d1b6d3cfb6475/93623170011.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/66442696816.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7b1d7807---2481560965.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/satufemaxa.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210728_1A4D6FC5D0FFEFEA.pdfIn PDF document text
    • https://effetre.biz/file/24725035852.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/lavowojeniwu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a160a543306---63593833912.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/nufosaxobazubuvitin.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e6nap7gjgbsf49mvrdsb0a3ru4/bagazolevi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/12409879144.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/nikapemuvez.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/45mklgi2pouioiqab62l003567/reweruduvewewikuteke.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5d211e800740ebb3e2168a8f815595ca/92001644259.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vusolagerow.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/83279107452.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b0a4ae72fe0c46dfa0650c593dda4c06/pusuzimibewiveroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=company+law+and+practice+taxmann+pdfPDF link annotation
    • 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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 17064 bytes
SHA-256: 3f76b2f5aa332648f83f15825dc9c7dc94b110479ec23b1e481a02dceab8379e
font_02_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 10944 bytes
SHA-256: d21181c4bc6c220f6fb99e17ad4610b850fb232eaefe678648e36b365381571e

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