Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf6666e155cce6c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-21 04:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b4245d0f45a524092117c30eec963ea SHA-1: 5cac3218e8b27bce6216d6708587410b08fa4491 SHA-256: cbf6666e155cce6cda486512536038fb769e583454ac74f2ee32da9bbd754566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=reading+comprehension+passages+with+questions+and+answers+for+grade+8+cbse', are likely used to redirect users to phishing or malware hosting sites. The PDF structure and the nature of the URLs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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://crysiq.ru/uplcv?utm_term=reading+comprehension+passages+with+questions+and+answers+for+grade+8+cbse PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160757f9af3900---28696024755.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/zibutogi.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xipumegasoxujivitatidu.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210626070201.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731cca78749---jupipapov.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/df58d97959f0093c9f3a186f31e70ecf/redidawopuw.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/suxete.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/sonojeme.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/699eb8eefa106b1e11a1f5383c1ad5cb/xifivumedo.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/mezipararesubojuvef.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/736e8ea0a9a8092e7e6ef00ea18da4aa/sudejati.pdfIn PDF document text
    • https://onlinendttraining.net/files/xajaxapijapiwa.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/91315200704.pdfIn PDF document text
    • http://jarosi.hu/files/file/17131551498.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160762d264d0cd---pedajiwivozifine.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/pmicq9g54fvktr3u101flevc11/21006885441.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/fefazatedizunifazuzod.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca16822033---48637546767.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096b12c1fe---fajarisibefu.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/96600033553.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4dfc1336---18071585350.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af987dd21c7---ninokujovipa.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/luxevoridutinika.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb1c6ca7db---27926267975.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/365cbde7aa60c64536e967e9304557b7/11187005619.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/16181538214.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/80251380496.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 11744 bytes
SHA-256: cb1843dabfd93eafd0c55d51e111ec43b2e0bb6b9f450e5b3a6b204bef1aa08c
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16864 bytes
SHA-256: c5396552743df2a00894216eff93ec0cd2cfae8ad38dba724c54891d7d9b2e36

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