Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f9d8d0e0467f1b…

MALICIOUS

PDF

81.4 KB Created: 2021-10-14 13:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a00736a5f2318d136a0fba77283dc070 SHA-1: b460d512301407e8836ed07b57780892a1cb44e2 SHA-256: 76f9d8d0e0467f1b4c86c54631e41b4d52937aa265cc24b4f0eda7e510cbe4e1
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 ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bnbcostaverde.it/userfiles/file/89999212671.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091001353056.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pizasupivogelojew.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/28063286393.pdfIn PDF document text
    • http://katachizu.com/img/news/files/piralokotiredakowilujifi.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/jepewinakeluxes.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/tedasuwirosujekefid.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/80674953111.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/43553317122.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/89012200700.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16164d3c2489eb---40265376172.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/26219682665.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615375306fe02---zaxilegifeguva.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167d59dd82f3---jivurajax.pdfIn PDF document text
    • https://ebooksweb.net/files/file/japaxewagubimep.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/rubafoma.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/zikox.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/bizisoju.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/64299120268.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16166df705bb7a---22305319452.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/newutivozidelabire.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/zejusikewirutaxati.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/895c3ce99335fd24f95b6f821dd02cc5/90810215090.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/denefi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0016e4d4f---90465599026.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/weluzopivopogerebemupelu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=cookhouse+at+dempseyPDF link annotation
    • 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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10652 bytes
SHA-256: 6520cd30f72861a5e77f1275dde141f8b111933dd80249539bb8bd62ad5ef13e
font_01_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 18440 bytes
SHA-256: 800c3c42c70648e12a67a4e91d764745f4faf08fafb2c11694ca729ab5463aec
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1