Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa32872d1263f94d…

MALICIOUS

PDF

84.1 KB Created: 2021-08-27 18:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1bd4f5523625dd4931bcf6603bc15cef SHA-1: 4d94724901fa073eec26bb57faa110b61f1e3eff SHA-256: fa32872d1263f94ddad2ccdc7746314207fbe3fab19d51647d195d45c011f4b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially untrusted domains supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cdwy028.com/uploadfile/file/20210708044954.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/11422f575fa7a86814c5c51805af2801/92993157644.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/76734143182.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/fedenubapefasopoviri.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/96039966906.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/72737422854.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/l4rjsusf5qf36e54u9c0iv0jjv/vujinudexuzunesojolabuxen.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/7d4958953d85051948e5f798441671ac/44823548891.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/56854614866.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb477a86603---44151239535.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/25372413385.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/44903563568.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/xuxesezegesuku.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/xibowaxazegupuvaludopu.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/4e50eeed1e8e587a15ea175fde8b0074/mitijukirux.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523052021370.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/dutuzodojogezubu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6d157b8bd9fbadd62797ea3adab977b9/mozibekefevatanelafire.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16126fba2aeed8---6111187011.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/opn89bnrq97fl4a1k4qka6n98e/83559677505.pdfIn PDF document text
    • http://sgpeo.pl/users//file/fupunaz.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/619823277.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1245d6d24a3ce7bb0e76912fde2a1084/55997812165.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/q8j1bn826gvs0agsq5hbheat9m/8263317049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=include+picture+on+resumePDF 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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 10564 bytes
SHA-256: badfd6243d4fc06f7469d4a1ebfce5bc10fae4b25ac02ab28b6f5c26b1a816fb
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 17112 bytes
SHA-256: 7e3dcec9f21d8ed8a0e5f33a4a3baa9ae2172e55c7183978d0f12bdea599caab
font_02_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1