Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf1d579e7b5ff00…

MALICIOUS

PDF

73.9 KB Created: 2021-07-10 04:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c1777ab45fbd29543bbd1632018ac57 SHA-1: baed48fa144082b2e19bbd08be9a503be709e6f6 SHA-256: 3cf1d579e7b5ff00a3ac3cab33b205044ce80e08f450dec7ea9c93ba9ccc888d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to facilitate phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e5172d69436f0def5858e852bda29558/momasupanewewevenoraj.pdf
    • http://elencostruzioni.it/userfiles/files/41030305409.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/218451df9db468dcc501342ba734d3bf/41255246103.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b062c9bb7---viwirejotokuvujuxakowilo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4qfavulalhontra2b6osro8kc9/891869264.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82ad6fada---xerezadire.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f2a102c1---mabadumavowadanax.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05992eaee---tajagegenitolek.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a25250adab5---29664872778.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8708becc3e57e753a8dfd883c13bfff9/70038139550.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b65a0d2960d---nobolanaverunigefitab.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cn7mta3j7licenr4g1s6u4553p/34081204423.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d6c27ac9aea221c45a084caa402c569a/92558677224.pdf
    • http://photo-preiss.com/upload_files/files/jutatonemelodebasaboviv.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cf739dec118333e4fe60016ad8510bf8/bibuwemepozanovoxixejedat.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7be92a68f5624ff7027d98d7be5d1118/80002456995.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/19506980699.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609104d0a2adc---nazaxiwejinepufa.pdf
    • http://diysmart.net/userfiles/file/81019612963.pdf
    • http://1night2daytour.com/ckupload/files/37176919258.pdf
    • https://www.carrentchiengmai.com/files/7343888882.pdf
    • http://cecev.com/stockages/files/zuxafifusosa.pdf
    • https://palcev.ru/userfiles/file/97436890891.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gone+with+the+wind+actress+crossword
    • 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_off0000c09b.bin
fbf97fc3da74f76eb7b2b40d7165f516cd3c6c53215dfae08bf28b6758026fec
pdf-font-stream PDF embedded font (sfnt) at offset 0xC09B 16264 bytes
font_01_sfnt_off0000ea40.bin
11f3afb70e055233dbc7e7b2431f911cf024d584d103a0cde8c1b2f9a4bc4895
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10544 bytes
font_02_sfnt_off00010259.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16792 bytes