Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fda1fa7349adf4…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 19:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61fdb58f6fae632685d90e81cf30c052 SHA-1: 2f857b62f3e18e9ebb1901e0613360093c7ca44a SHA-256: 84fda1fa7349adf4ac8516a063d86c96d1bd08e7ad3005d7846203281a367bf3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly indicate a malicious intent to redirect users to harmful sites.

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08367f1bf54ff255b912af7a9645f764/58243996358.pdf
    • https://jotekonybakterium.hu/userfiles/files/36005224451.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/325e41866757b43d92d99409c7c674bc/ruvopimipawusenuzi.pdf
    • https://247hvac.ca/fabulous1/uploads/files/43334418852.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/re3etnn3pfa7vu0hp9t5v7uhl9/zigajaku.pdf
    • http://asbufestival.com/uploads/FCK_files/file/39987819840.pdf
    • http://gyobel.itpublic/file/doxoza.pdf
    • http://techscreening.com/userfiles/files/8629055504.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087d659d0475---newowisebuw.pdf
    • http://uhy-th.com/image/upload/files/jezeve.pdf
    • https://performanshost.com/calisma2/files/uploads/38963759548.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abfccb2b5---29719003194.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/009b10b396f587194feebd1663f92293/nugejikanenagiroro.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0c6e1fb28f9e8db7c7c4d42603c5ae4a/fetosifotelu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7c172fff---vakozitulidukoteguv.pdf
    • http://www.sport-konyv.hu/userfiles/file/84465936760.pdf
    • https://sonarmusic.hu/up_image/file/xaretupogesipobuponinuf.pdf
    • http://curry-box-deluxe.de/userfiles/file/60098528812.pdf
    • http://chandigarhdatarecovery.com/files/file/96134688180.pdf
    • http://aklond.com/UploadFilesfile///2021060321482195.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caea24ca137---gipowuripukekifuzinuvasu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4775b58eb6---77094969255.pdf
    • https://pasarantogel.com/contents//files/fubipupufijofusezigaxa.pdf
    • http://sugarfree-gelato.com/upload/file/gomebiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=surgery+textbook+bailey+and+love+pdf
    • 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_off0000f044.bin
8889c15794c7861b0e80540a7488ed908aff75b778d377d798c0e421b4910e0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 11192 bytes
font_01_sfnt_off00010a39.bin
1924ea7803423511f3cc1aff84bb387732e5244ddb8a55558a3e54291a502537
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 18108 bytes
font_02_sfnt_off00013a57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 16792 bytes