Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d88183eace0abf3…

MALICIOUS

PDF

94.8 KB Created: 2021-07-13 23:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f9997e4a85733a7e167fd78e3822e40 SHA-1: 0cdac2066a7f268aa3d6d0ef6b6fc1ca8a9daf62 SHA-256: 8d88183eace0abf3ae7fc78aa8d325ccc2573ee1c225c4af5d3bf3bab0fd0e7b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/14de1835d96aa9e2c78ee4d950c4a4ee/gawomam.pdf
    • http://catgarner.com/clients/873270/File/93331714979.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bukavisisageximejiwejiraw.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b658d3dc9---jegepolisudalidakejud.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/219ea914187150da22de1580f7d4eff9/kobofidufaxixoguwobaga.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af262cd08d9---jozudoj.pdf
    • https://bhsbeacon.com/FCKeditor/file/texejejuvonisapovizadesuf.pdf
    • https://oddluzanie.net/userfiles/file/nazukobilugoduboxumol.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d1bd04ab---ronavokosegadawabebumajo.pdf
    • http://canphantich.net/Images_upload/files/63130393493.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qssem54s5nid1bqno93c0roql6/73474351585.pdf
    • http://marketherballize.com/ckfinder/userfiles/files/nozavixugesori.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc60b977e6---76521882005.pdf
    • http://apsons.eu/files/file/gejilijetarowejoxegozete.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c408a40e502---5389178682.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160889d00942ee---97593839934.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/50995114424.pdf
    • http://ronaldtan.nl/images/photo/sixilo.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0ab210de---22740100022.pdf
    • http://mikomisushiwc.com/uploads/files/fagijutezavasevazolawuvep.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/41548573486.pdf
    • http://geodez.com/pliki/file/89489885800.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=juicy+questions+to+ask+your+best+friend
    • 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_off00011136.bin
0f89935504e7d74cfaf2ff119a0884894a55c4aabf04ce6aece5ff471236aefb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 11004 bytes
font_01_sfnt_off00012ad8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 16792 bytes
font_02_sfnt_off000142ea.bin
508dd6ed4d3a65ec2a02474818418241ce367984b2570bc880f62f9e69075db6
pdf-font-stream PDF embedded font (sfnt) at offset 0x142EA 16528 bytes