Malicious PDF — malware analysis report

Static analysis result for SHA-256 b466f294545ed462…

MALICIOUS

PDF

96.0 KB Created: 2021-08-10 23:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1de726b86aab57b52b475ec98ae02baf SHA-1: 9202e5d0f8b6f6b238dc08477c8f094b37387c64 SHA-256: b466f294545ed462e28772f40f15c002c94da8f5a7ef08a81e8c0a32fa0c1469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092610ea4c67---86011663020.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/80755344453.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcef2cc284---67108776749.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089026ac1944---jiwifolatulorixej.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/430739a8429c7a9566f415663c04884c/80311915040.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/96601358419.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/wegexugezajenolozojefa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/2762167790.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/83370974450.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/10755020363.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ac643249325047a00db99c282f007690/jupitegapizusadaz.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/bitinida.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10451940272.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/36068a7f1dad87aec5ad3d964b2d0cc7/15368348553.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jawuz.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/4045719247.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3655b3e7c2---33931551440.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210704205722_l27o54.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3c2cd747---juvebeduvogubuvuxujik.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6467c316dc2e7ea233e6b1583fb56862/16186429836.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4354309c2---27711495998.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/1140209464.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/kuderexivokejiten.pdfIn PDF document text
    • http://praguetransfer.com/files/file/99365299152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cuantos+huesos+tiene+el+cuerpo+humano+como+se+clasificanPDF 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_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 18060 bytes
SHA-256: 264fcb89fa0e0004e193e1fbc0ab1ba668814dc5df2b98007505d5f08990303b
font_01_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 10876 bytes
SHA-256: f2d53cbb4d9b8dce88a8f33c9bf3b03f619cff9f48baae0d1b6b0365ca892320
font_02_sfnt_off000157e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1