Malicious PDF — malware analysis report

Static analysis result for SHA-256 16944019fdf95426…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 06:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0de6dd92c33e295639da70ac934e9ea9 SHA-1: 5515209bb8158b074dbc4a5ce8c2c2344bdad5a9 SHA-256: 16944019fdf95426fa0d135df2b574818401d66a21a4ffcd604c354f2491ac3b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of link farm heuristics and compromised CMS upload links suggests a tactic to distribute malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dd45g0mgq345qhi7h3kbfqdt1k/14029678966.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5b625b580ed21928bc56c5cd86296e80/zikorujomujamo.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2bc4b3c9c2ccb74aec772d52e5fe4a03/tiniwigonaxezesitug.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/91135508907.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b264a7274f26e6facdc7a37b0b981ab1/mopigokuxazazi.pdf
    • http://ty-int.com/files/files/44108327894.pdf
    • http://kvbm.org/pds/userfiles/files/rejokog.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/24nf99i9c0pqta7rfjtui5ktpb/zodagiju.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba2fe5de75---liwede.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/42692151067.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf65c5336---98399788601.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59390f1cbaf730360dc88e72d520125f/suwexulemutunimuvomad.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16097c9bfcccba---52348637549.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/gujasuxuzitimurizemolo.pdf
    • http://doks-films.com/pcms/content/file/86365605055.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mosazazixodexupajuv.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0e4f8fb89934e4f6b2be5954aa9e475e/60576615654.pdf
    • https://plantbiochem.com/ckfinder/userfiles/files/71359228415.pdf
    • http://zajazd-broadway.pl/galeria/file/wokepazafovexugidavawu.pdf
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/basojugejakokapanuwen.pdf
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/lomukizojirige.pdf
    • https://exlite.it/ckfinder/userfiles/files/68585613360.pdf
    • https://holocaustresearch.pl/nowy/photo/file/81057387622.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86f7ea052---kigogupuku.pdf
    • http://jikaramen.com/uploads/files/wumat.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f4b2e8c5---48783971471.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=definition+prismatic+compass+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_off0000b96f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 16792 bytes
font_01_sfnt_off0000d186.bin
dece1c8cc05c5553f571013d1ad7d59182e7072d50bd42829345c0e3d5ef4d86
pdf-font-stream PDF embedded font (sfnt) at offset 0xD186 10736 bytes
font_02_sfnt_off0000ea32.bin
ecfdfd312799767451fe18e3dfa85490faa9887fa233f003684eda99b91ca244
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 14568 bytes