Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9bd968a0807803…

MALICIOUS

PDF

74.6 KB Created: 2021-10-04 22:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 69c56f267e44dfc4baaba52c81882969 SHA-1: 96469665bdacb1c5f1c18d9e2d83b94d1dad1fbf SHA-256: 3f9bd968a0807803e5a564c05f66e2631cba735be9c89419da6e05f71b98e717
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be facilitating phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=multiples+of+4+from+1+to+100 PDF link annotation
    • http://tasarimak.com/ckfinder/userfiles/files/sijonivobodu.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210919045311.pdfIn PDF document text
    • http://mrybalko.ru/files/tamawuzegenokuwawez.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/bebetufibugagosavipim.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ut0bqbs8e24ffingbemiln130j/pavupixab.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/6244160376.pdfIn PDF document text
    • https://network-italia.com/file/38210311394.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/tupeduvetizabisixoma.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/94179317636.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/52122380344.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210924_74E3DCEA6125C5A7.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d42270da5e---15731188095.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/32766686801.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613777f718ccd---pugumusalaluba.pdfIn PDF document text
    • http://xhzhengli.com/upload/29687156817.pdfIn PDF document text
    • http://klemanpince.hu/files/file/67786817228.pdfIn PDF document text
    • http://skupka23.ru/upload/m/64433411187.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/33702458811.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ec6c05032---97481794509.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/50528411199.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/11092858479.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/rebonaririrur.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20211001_C210216FC593C4AC.pdfIn PDF document text
    • http://1855-4080.com/userfiles/file/rurox.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/69922580933.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_off0000bea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 17832 bytes
SHA-256: 2d6e0dfdb6a3c4f85a1e1848678cb90f0c05d706241ca072f292ba3022d3ade8
font_02_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 10596 bytes
SHA-256: 8b9fd174de3b86d0f29d2aa9a7877e921347c418ef268581124d7896a1037be4

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