Malicious PDF — malware analysis report

Static analysis result for SHA-256 5774f2ea1dd9804f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 03:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ea25fc1423d7fa01a0326af3394c393 SHA-1: 4e916384cb2d3ffd5551e9b62d1ae62ced3a5382 SHA-256: 5774f2ea1dd9804f582138238dc6e3cd62111356718b67a8ec2856c472671998
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation. No scripts were extracted, so the primary attack vector appears to be the redirection via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://faltprasten12.se/anvandarbilder/70/files/36580450673.pdf In PDF document text
    • http://dagmare.de/userfiles/file/jirulajanatafarapajol.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/49516361176.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/43668160404.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d007f73555437ede97ea82b1c75212e6/55342962242.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/918a200ab42160736c030c960a7d416c/babofatone.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/89094454537.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/62bdf3d170e7ceb6e2d444ad86b131ff/43459738843.pdfIn PDF document text
    • https://nadamasristorante.it/file/727473136.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/widuga.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0119fa8d86bee8b2c4ae1860dd5e1903/14451380457.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608912f328763---35435023262.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/31306835311.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9ca3a51d---sunefafate.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e773df91601---38736217308.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/5354640231.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/52307851043.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/84364648406.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dbebbe6c---12922265628.pdfIn PDF document text
    • http://healthywithhart.com/res/file/93208645000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=independent+variables+worksheet+answer+keyPDF 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_off0000c4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 16436 bytes
SHA-256: 064a50dcdd838b1b98e918ff7053d3e81c0df32365b98c96a7c825664446afd0
font_02_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 10940 bytes
SHA-256: b0b62763a28c998a0ce207ebc3ae81772a65fc21992a6fa69bfb7022d48c4105