Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fa9c706385b004…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 23:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdc1450ad9a984252930c54f9dbbfda8 SHA-1: 1525a4626ab17684e889afc1eda747189b598cd2 SHA-256: 70fa9c706385b0049b8383579f2cd21217636badeb12bf9b6c8c40c03678035f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dienmayminhchau.vn/uploads/news_file/98324335629.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/97867290916.pdf
    • https://aathichudi.org/userfiles/file/xuduka.pdf
    • https://stmarys-perthamboy.com/upload/File/53660383680.pdf
    • http://szwygs.com/upload/78695664626.pdf
    • https://simbhaolipower.com/images/file/97719679757.pdf
    • http://lg-palette.com/upload/files/61087652402.pdf
    • http://studiobardinisrl.com/userfiles/files/vizobaje.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc585791d---46286781941.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a5e84f09e5804ded5dc75722741cb1d2/21803843440.pdf
    • http://baobianhkhang.com/upload/files/21163348503.pdf
    • https://llibreriaha.com/img/events/file/rolav.pdf
    • http://metaglas.kr/userData/board/file/xewubuzimikoxiwopokivij.pdf
    • http://saluteebenesseresas.it/userfiles/files/85007560606.pdf
    • http://www.aragonemprendedor.com/userfiles/files/26036828837.pdf
    • http://hbtsap.com/Upfiles/news/file///zosizumikesonu.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1acb3d3bf126ac807c245fa3eddb64f9/57740439047.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c1588c8fc7de8434d295f3d4140f483c/1304439832.pdf
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdf
    • https://limblength-sldf.com/userfiles/file/nojirezis.pdf
    • http://soc-in.com/data/media/files/86884089891.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/fizifavo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=descargar+videos+de+vimeo+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF12 16792 bytes
font_01_sfnt_off0000c724.bin
4534ed811a3822f4ec491a623b8417678ebb6759b14fcf7e696dea4a64f23385
pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 15996 bytes
font_02_sfnt_off0000ef4c.bin
a73f52b36524f77001b07a7d38b86199725cf0f3669fa76eb890588618e8150f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 10636 bytes