Malicious PDF — malware analysis report

Static analysis result for SHA-256 669d9e323a3a48b0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0747540e3c11f64ec23b6d3833402edc SHA-1: 22566265ed60731a3912d3ff4e8c8e5316c629e6 SHA-256: 669d9e323a3a48b01251718b1ea54e363863cef9efb341a358eb2b36f525678f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://budka39.ru/files/80886775810.pdf
    • https://mosallaesf.ir/uploads/ck/files/tavojidutavogejuzil.pdf
    • http://antifftech.com/uploadfile/file///2021090904450974.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/49746471897.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903114913931786.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905153456596142.pdf
    • http://zatexpress.com/upload/userfiles/files/teviparovilunavate.pdf
    • http://munnartourism.com/uploads/file/73209319949.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712d798f3---84487135297.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354de99d0e4---novapax.pdf
    • http://eaas-journal.org/survey/userfiles/files/90770080852.pdf
    • http://bannails.com/fckeditor_userfiles/file/fibufunu.pdf
    • http://mexvp.com/ckfinder/userfiles/files/befowu.pdf
    • https://kirbas.com/img/uploaded/file/35460554995.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/wabapezaselamikurarovowir.pdf
    • https://autoskola-scp.com/files/97855424373.pdf
    • http://eternaseguros.net/files/files/gizijobeku.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/83591871780.pdf
    • http://torby.kbo.pl/ckfinder/userfiles/files/58001261097.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0cgujgamhgsk3krl9ep1rsfn71/51605272204.pdf
    • http://artikos.pl/userfiles/file/guvidevizerula.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0b8eb694babbe738ba6de3abf2ab2fdc/liporusona.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe84669d54---17373811166.pdf
    • http://princeverma.in/uploads/files/mulideriruxonezadimemawo.pdf
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/44874336613.pdf
    • http://pieseclimaauto.com/files/file/49117356814.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pinoy+quiz+app
    • 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_off0000e96f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 16792 bytes
font_01_sfnt_off00010181.bin
5fba8b14a6409d0e218b4b1a1259cbd2f92a8e46f8d298bd468b7eb57b7c0f65
pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 18860 bytes
font_02_sfnt_off00013209.bin
0ce79374269e5ac25dcb5512fea7b0d16d5793f6d0e1d8a520fb2be213329e92
pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 10124 bytes