Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f46a7155fed28e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 03:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0602494767e01451d0c0c700d312e9cc SHA-1: 6aa06eac5878bad57ca4b49fd5577bed9fc6953f SHA-256: 22f46a7155fed28e8c329c2cf783a9130f6465402abcb0d8fd18724ef2dba5b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=can+i+transfer+songs+from+android+to+iphone PDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45ec3ca4---42904681767.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614980c1111f9---tinofuwukatagojagir.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dvjluaivp5knvj2je6075102f7/febakakorarigasazapoko.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/kezibenim.pdfIn PDF document text
    • https://thehouseproduction.net/file/xarinawifa.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/19825209782.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///sirowumegodunevijezir.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/82547154589.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5dda057db---91975237267.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/lipazukamikata.pdfIn PDF document text
    • http://grabnerestriche.at/jusekik.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/94837678830.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/dadenuseruvopubofupamol.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/defujijipilu.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/95323833043.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab958412d---ragumabemarasifisufa.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/nupunorilogapud.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/2083740.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/67d5aiclapgrh1kah4mu75e2h4/85055990078.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/xevinalox.pdfIn PDF document text
    • https://verner.lt/images/files/71777514070.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/juturusesefiwa.pdfIn PDF document text
    • 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_off0000aece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 10928 bytes
SHA-256: 835e59cd6e6298fea6a92dc0e313531be4d3b4af1388902872516fea88924c29
font_01_sfnt_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 17076 bytes
SHA-256: da2e7aa87e7f167694d42a2faf73c8a88cb4aa7159b5bd028ee2badaa227321d
font_02_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1