Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d8b9d6f87f734e…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 14:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 653b298158bfe1f91b2d7df63ad1cfe7 SHA-1: 456bd4e122171f31d0d9ae828633b979fa7d1fb3 SHA-256: 03d8b9d6f87f734e8c34bcabff1012b48f0d3d0abca5507d97bb037181e89fc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious or compromised sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3e298402---47903891055.pdf
    • http://jingluo.net/uploadfiles/files/wesisavijodexut.pdf
    • https://bdsvieclam.com/upload/files/logutonogaratigugimonavix.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2460809b5e---botasutadolunegib.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mrs4a7hrn33bnbpmnj0dqesh45/15249038285.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/84547a207314d02a2f6b22eb3d606695/mosasokotexuj.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/linasudokin.pdf
    • http://magendans.com/imagefiles/file/38175764308.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/71087c45b3f1c282b9549365bb33c674/97653363172.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a207a5fdc---maguvojef.pdf
    • http://liccuza.ro/stiri_files/file/tokafalobovodojetexus.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893cd3a82c---jipasizub.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/54339752432.pdf
    • http://hiace-yoshikawa.com/js/upload/files/zisutedubi.pdf
    • http://duonglaohanoi.com/userfiles/file/zugusu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wedding+titles+premiere+pro+templates+free
    • 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_off0000e084.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 16792 bytes
font_01_sfnt_off0000f89b.bin
7ee520c09602a544a0ce59c48c8323735a2c2c47c3a44dedf60e7380039d9e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10832 bytes
font_02_sfnt_off00011159.bin
40a92364bb1e5043f556d28aefb06714b8693e46d293175bb06d8f0244d6fde6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 18184 bytes

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