Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a93ba5cd8997d2…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 10:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 223f43adc6ba9288a15ff2c4113d3f41 SHA-1: e838451d41ab42384f43737f0838df9159560155 SHA-256: 66a93ba5cd8997d260b89a9282b9039644753ec813fd679d85af93df714974fd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=biographical+sketch+of+isaac+newton
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4naq7ofuc6e5moetpbql05dgf3/dopan.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c258e245a2---dotukefivumuzoxid.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/kipimupofo.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/205075a58ee98ce74d8f8905ef31044e/4915081474.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88281420470.pdf
    • https://kisikana.hr/userfiles/file/95643699060.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3fca1629df59656660e711695d040beb/gamuzidimalubuv.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880287aa0ba---95282960754.pdf
    • https://cuacuonbentre.com/upload/files/58087526748.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7adbebdcfc1448c22a9155180f69ee90/nivotezezalara.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868a0a8418---debemavanojonuwu.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0327e9700f---5035228417.pdf
    • https://idd.no/ckfinder/userfiles/files/baxasirezetozijedoki.pdf
    • http://adaviestransportltd.com/userfiles/file/difavimadu.pdf
    • http://praconsulgroup.ru/pict/file/tiseliwevigewi.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0293dddd---7685323888.pdf
    • https://t2sc.me/userfiles/xomakuledaberijovap.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a75d45466---83607194774.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1smbqrboalun07f49l1csd6g86/98535166.pdf
    • https://hogies.com/includes/template/uploads/file/68768811921.pdf
    • http://digitalpolicycouncil.com/imagenes/file/xalikaxasibuworex.pdf
    • http://gtshotel.it/images/file/kosazifitomakij.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a2412bfb---fexomapusivafaxopivo.pdf
    • 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_off0000f53d.bin
96d12c99fee2dff770cfe676ae19d33e217567f2fdf9ff7148c8da0befcf87e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 10988 bytes
font_01_sfnt_off00010ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes
font_02_sfnt_off000126e6.bin
470187839c2211bb746eb953a6a55619f49bd21dfdb4a2b4b1612bc8405cc31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 17024 bytes