Malicious PDF — malware analysis report

Static analysis result for SHA-256 387b181bafe0101b…

MALICIOUS

PDF

93.9 KB Created: 2021-07-18 14:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ec99bd840adddfb4f33b9e88a78b0a9 SHA-1: d81026b8aa35ccf4ee94dc97865671aaa668c671 SHA-256: 387b181bafe0101b5de2283dfa243d6b4a98e26aeb0c7bab727b679e7f8f70e6
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/7n7lsf67252g7j42k7t0mn94ve/jixafi.pdf
    • https://art-lamps-rali.eu/files/file/94779793442.pdf
    • https://baongochoa.com/upload/file/48176559088.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/aedf410fa03c817c12e0874b115da3b4/57896631962.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cb1e371973046d1acf0e57a59e437622/dejonibedenuruvuf.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c04392cb91b---83312545746.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27948066f---resaturemomeje.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608beee917142---77110582188.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/gobomazofatap.pdf
    • https://istocdukkan.com/userfiles/files/96671111856.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/somiwanimuzeduvufetil.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b8e10678e09433a13d931c43934f1cd9/76001208432.pdf
    • https://ev-owners.jp/userfiles//files/35388197351.pdf
    • http://olech-rzeszow.pl/userfiles/file/motelizoludetenenidobatal.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/62376141001.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21584d76f---59191270835.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080adf4b4693---kazatopapumedegewomo.pdf
    • http://amirafouad.com/uploaded_files/file/7574681960.pdf
    • https://bruceleevideos.org/images/file/taxupidutenonulejifuxami.pdf
    • https://peterdegendt.be/file/papolikaligetuxo.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa902c5b50a.pdf
    • http://vom-ragnaroek.de/uploads/file/lukazafetupij.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/1tdcm0j5v40lr1fg9ta98kndp6/dolemosiwapiwezikubi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=action+words+with+ing+form
    • 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_off00010d94.bin
93e033150e1a32664039124dea92e797c6e0f3ebf2c37a1f4f4900f1e0709dec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 17108 bytes
font_01_sfnt_off00013a95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 16792 bytes
font_02_sfnt_off000152ac.bin
e5a3341e0579cd3c6ccf8798d3ac50e75fc61cc8ffa34fc8389e77a2f0d9254c
pdf-font-stream PDF embedded font (sfnt) at offset 0x152AC 10652 bytes