Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd59317ee3ab316…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 07:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 193ebe1e03f8ad7622f522d4aa7be8c7 SHA-1: d43d1f095eb87555b91f69847627786a244271ac SHA-256: 4cd59317ee3ab316fbab8c7e70e263234f108e1e4ec7cfae56126db39ae4197f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, a common technique for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=rti+act+2005+section+8+pdf PDF link annotation
    • http://viewcs.com/partner/upload/dextfile/kigikizokojez.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/17187552574.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/xonunezuretizuvisu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1dd152d56818b2b09549789a373ef453/jifovevixuxevanijetegobif.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/dd406f817395dec0af4051c81ad2d16f/wemol.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/raderamirotukumar.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/sesidavabokiruvenesezodo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f0028f0fd---30260670348.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/zeziwiposujixi.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210708154300.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/84779827826.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/74627478117.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/tiwiga.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/kosadupopafe.pdfIn PDF document text
    • http://ruihuitax.com/files/file/buwotubedukipiwijusuref.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111bda9934de---7508495747.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb142e031---lotokupeto.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef71e4866---sekukoripulevupuvupuk.pdfIn PDF document text
    • http://bndweb.nl/upload/files/mupakuvakejuxekugupemaju.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/78569185656.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/acd431591a1f260ce01fd3a1fa9bd2d3/nujubutowexuvunegim.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tj2l5q35h1uc0l0nsepup5ss85/8355124964.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/gafuvutefugetowuw.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zixuxolora.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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 11096 bytes
SHA-256: 6da7df252e9d53b451182d092af6d1f082543f15b23151f45177d457a0d3b605
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 17328 bytes
SHA-256: cfe36a1a85d5581e3c600c340669950933d5e0ee5db44588a16d734b9a3c8e22

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