Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce74b890e94d040…

MALICIOUS

PDF

89.9 KB Created: 2021-08-09 12:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9ec30a7d0811c88f87d960bf4e08a68b SHA-1: 8f6742e276d322a33c4539b94158cfad0a0f0b09 SHA-256: fce74b890e94d040b1ac7f0728dc5b5bd45618182e5d091c373ced065c06d15a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pistant.ru/uplcv?utm_term=coulomb%27s+law+worksheet+answers+physics+classroom+pdf PDF link annotation
    • http://maszyny.pl/userfiles/file/88894273123.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/fukasugibebaluzefozoz.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bmrntlddgsp8t6r98hi4q35hb6/gozivozekaxeveweve.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0e03e73cb2ea2ef28c33808a830848e7/75524271242.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/59974713222.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/57253e3da09315b8651350fd0f6990cc/nukibusikujinikitigikiwi.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xukegenujorevoz.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/ripolisopodebesoletat.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/metegebeg.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/14367969908.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20da6c286f---77190419876.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/zegevapunurakefukabi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05abbb211a---xumelomibekasobizuzugimow.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f88e24d5---28954947184.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7uhra8v912ivij8a73c6f530ih/mapesurugurijarenuzal.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b86d479a9e---nusunoziwe.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/80cb244d1db10fd56d76a02d023939a6/falanovupamuziru.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/15631699041.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d0fb60e3---47940963901.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/49ur5i5seuvtnv643d442am790/zobev.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/gagexojoxukuribopeginimu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/74993b8b38dad8edf260b2f87f3df9c8/54911232189.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/libanazipafisotadonuxuzeb.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e1336b4f---29977593807.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/zetejawafirilinaxa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de4d33e09---juzedoj.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_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16656 bytes
SHA-256: c2e6aa450bfadbfcfc55a1d5465fcc5364c142864fe89b1865fbdd3f5d3296d5
font_01_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 11484 bytes
SHA-256: 19902031955515f5bc244fdb37c80a4da3f15ac50d0d60e18bbfb356c4d93f24
font_02_sfnt_off00013e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1