Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb6a5dac1585565…

MALICIOUS

PDF

77.6 KB Created: 2021-08-08 03:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a19fbfcf70ee5a579ecd57018eb9a32a SHA-1: f48ac2cfe1516742241f3bf06606405f065af071 SHA-256: 5bb6a5dac15855656504d6b2b9dd5c6b04ddf053abed9d27721a02e329054a79
154 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised websites, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8598

Heuristics 5

  • 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
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/998d4571dce801e7abf2be594357bde7/36867860671.pdf In PDF document text
    • http://cci100.com/clients/57496/File/kukizijiwudifokaforumade.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/15130086773.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160995a0ec6ccf---48791446112.pdfIn PDF document text
    • http://rc-modeller.se/images/file///duloberise.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/82183148603.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/r4rr35h7cbft81pr8035ok248u/35259263147.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/juzax.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/kepifapawokibufevi.pdfIn PDF document text
    • https://digireg.ru/upload/vewunixo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jsa9ab53gn3c8iv56ktvri8lgr/67185837696.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b04c8f10db8---mositobagogixibekutewokes.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/tizinipesigupakat.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/df81d809ab09acd6b85dff65bff92c1f/13179871220.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/zotowigawufasonu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0f3f34f1---bujuwidixazo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608304ea3d491---radanegorokesinaranowejem.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/fivavopovipatasixiliju.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/58afc2b6f98ae1f593619c82c71832aa/rumuteduxexebitume.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/19287481210.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/72292899996.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb226e59b---gawisipuronofonagoxe.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/df57da921d04b5cd5e1279312ba23300/borukoniwodotojali.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/52335091112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+ultimate+ninja+5+pcsx2+save+filePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 11272 bytes
SHA-256: 84194cb6b0081be4275961a4819c5e85138f4487bd6acfffd816787922b18d0a