Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b1ff5fce7cc029…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 03:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3b99e87fd97d34a99eb927a2d93cfbe SHA-1: 1fffd43a28c54305a106e3c60eea3971985ef649 SHA-256: 96b1ff5fce7cc029c5fe62330c5b8c767889f0157002430a8a73479400ed64c7
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://krisoc.ru/uplcv?utm_term=braille+keyboard+for+android PDF link annotation
    • https://heatingboiler.ca/fck_upload/file/24915338600.pdfIn PDF document text
    • https://isleo.com/i_photos/file/jolidonawisa.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fuxopupe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f066f3f636---dapesokutitufetonoro.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/1740388376.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/papubotegolonuroz.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/26884872697.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tokawuwanaladoxelumila.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/lorebuwomes.pdfIn PDF document text
    • https://akemi.ro/hirek/file/40618821139.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/85018111176.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/mugorazulofawavel.pdfIn PDF document text
    • https://obrbikes.com/files/files/vipalasiw.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614516c5415cb---284670945.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61474808b67e3.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/xedonakibunanaj.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413928ccf61---58356916477.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/91719493927.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/22771980628.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131265197678---51928244671.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/kitizuvesikolarug.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/32721091045.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8484c8b5676e82a7e09660c8db94482b/palubizalafolokuretepidix.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/kawikofas.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/togajeveluv.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/vokewoguvukovorikaser.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/72499922010.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_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 18112 bytes
SHA-256: f6418d1fc7aa5e1093301bf9401d733a70c9a85b4f27755bc2dd0887246737e3
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 10480 bytes
SHA-256: 95fb044709c2e4ee10ae0bb3e197f8c52225ba1af115d2174efc3ba795ce7458
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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