Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36d475e84e9d5e8…

MALICIOUS

PDF

114.8 KB Created: 2021-06-27 00:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aac99f251d86b6dcfc3cf5ea324c9368 SHA-1: e041b70e57024b269b4f92bd16573c49931fa0fd SHA-256: f36d475e84e9d5e82edf1ee44afe4f2926c7d823251f8ce337e608c7ce026247
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external websites, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. The primary attack pattern observed is the use of a link farm to lure victims to potentially malicious sites.

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 http://technocom.pl/editor/file/29486247159.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca59ad3d58---71013390076.pdf
    • http://aisef.org/uploads/userfiles/file/file/25095280818.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083fea85d35c---bugitilixaka.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951276b4a63---mufitukosebolozuxikegepu.pdf
    • https://termoformat.md/img/files/37851250857.pdf
    • http://studiospazioambiente.it/userfiles/files/67853649555.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb67954e4---xeboloburemilogow.pdf
    • http://hum-lucknow.org/test/fckeditor/file/guvotopedowolazirowivom.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608267de90de0---62984094529.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092220a84249---lumogugizotizuluxawefo.pdf
    • https://btcauction.vn/hinhanh/file/40039897862.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/23202603221.pdf
    • http://omonetach.pl/foto/ilustracje/file/61974214771.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7290883ab4---jekekusenenuje.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a3d3acd9---44284169332.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/36ao0n01i7a09tgvpijccpqpio/morebejobob.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/sbicq9gvethh0l4ohuiv510rpj/pesidafofewi.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e5153476---tujexizoxuxepat.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cffa5772---2805546102.pdf
    • http://sattamatkapatti.com/userfiles/file/subux.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/35896928727.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=only+a+few+people+work+on+compiling+folk+literature
    • 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_off00015f46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F46 16792 bytes
font_01_sfnt_off0001775d.bin
a0953fdd79695e8a57ccc37e3aa88653fbae5ed082371a5c8687ca80309ee43e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1775D 11072 bytes
font_02_sfnt_off00019149.bin
1695ff722185fb7b8302b12ba1115938baf81ebd0a3b54a47f901f265593b3cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x19149 16636 bytes