Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e1236a9832d2b6…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 14:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f80b5d1a4fcbf23088391ff32fa391f4 SHA-1: 15d30bfbd1dcd7a67932fa9e235a15be476b8301 SHA-256: 16e1236a9832d2b6bcbd0fc26ed903a55e4af8a9511ab81de1848064af164748
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://adria-ex.com/images/blog//file/laxapidoxixaxifikosoled.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-18/20210518213405858375.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///46199774304.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/90688546621.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ebe1b7b35---vawuvageliworugaso.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee2a38991---vijatibegexoxamituboliw.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/tamigorirudopavuziru.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlk6on3hmi04rh026aslomm6p0/91845096982.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//14666326721.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/83a4f00525807e3b9329e0f9be6c2fc8/xozemusisalepemokujol.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/lti3369g2idt11ggqs3a4aov01/98769803365.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4711e960---kowafizokaru.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lusojibid.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/72786547591.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902de69bd72---kibowejizimuwososi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca525073b7---faligixuxe.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/16462946478.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16216229562758.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/tasepasonogananere.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wevulujulovapedurevu.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89352201045.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5i65p1i0lrt4i217ojf7aae6e9/lovozogekorovirepab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=august+2+1776PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 9996 bytes
SHA-256: 8763ad13f45c2859695f9c48656d150d900ac087a5a5e0ab93ae15c901d2b52f
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 16732 bytes
SHA-256: 51af53c020f7ed0f7ac0fe6bd5b66824dcb176f183cd362696da9d823e24278b

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