Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6d38e5328c9993…

MALICIOUS

PDF

94.6 KB Created: 2021-07-16 17:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e432c214b40bae0055da5179b21d841 SHA-1: 7cb99c657fb0126cf02fbdd021f32e61d08d1541 SHA-256: 9b6d38e5328c999365a74f4ecd191c48a62899f7a4e4aa976078b4d795d2509f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link farm nature suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af0be4f88---56829500854.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5befacc0f80a516ea1607d72dbcd6849/wopeborinofuf.pdf
    • http://massageindex.nl/images/uploads/wapugepesipax.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/tun9g164hqnjs34ju70gav20ap/fijetimibikiwivaxapene.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/01220769d7c3108b59a7255704684c1a/50724943625.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/potitevupizijufit.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16086235e6cfd8---92593386404.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3407494cc---puzobilemuduwelufan.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6133c7c336a2071e79f21e7973c49935/megilogekakivifamufem.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6543f882be9b8ef0cac1289cdf81b3d8/14335946619.pdf
    • http://ahkjt.com/upfile/file/galepelaguzo.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a9fd61cca7b5370e795fbf89f5ad01cf/17155725394.pdf
    • http://dzstock.com/Upfiles/file/82132621817.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7djseg5spohdrd2pe01nfvt6af/60218544674.pdf
    • http://rebizplus.com/userfiles/file/74121389334.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b6bf01e3---27198803840.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1d3a94a1d45a3f4218c1c2f1603d7393/67807444076.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16073371e12fbf---85049807807.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8e9ba053---zosafogebuvazefi.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d49f95d71---benuja.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a12788d8930---25152320186.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9be3c5d74---65546108881.pdf
    • http://ritadas.in/userfiles/file/49380975374.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/cb6f7c628ffa7d0ad518f5d8e74f892c/wunizakazaxesora.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/t95kn3hdsrl9kvnmcppkdq63ot/2049999100.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624911153_06e424b18f.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=good+acceptance+criteria+for+user+stories
    • 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_off00010d32.bin
82d65cfdc56bceb16e9e26d1867bd42f573abaa5795a86fbbcc87ee58a171cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 10708 bytes
font_01_sfnt_off000125e7.bin
6fbac880a1d30af46cec725dff0a61231e9df7b94b555c25877f2d05da9ae5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 17292 bytes
font_02_sfnt_off0001530c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1530C 16792 bytes