Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94bd00c189d4c21…

MALICIOUS

PDF

81.4 KB Created: 2021-08-17 04:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 303d6cb4d6b37fdd0991edf0a169dd2a SHA-1: 49c51ca3dd82ad51d89baa6ba01e7de3aa17c6b7 SHA-256: f94bd00c189d4c21787224a55fdb52e47556ed8c0a23dc3986d3493aa17250f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The presence of numerous external URIs, many hosted on potentially compromised or disposable domains, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5fbbd4a46d825b22df97a31e4164d4d9/valelimugomudimaxa.pdf In PDF document text
    • https://vinatech.com/userfiles/file/43642996643.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608d031ad69a3---35981478658.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c853aa4c13662548958fdb3d10485f9f/mukerilukumorej.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/xopopurobevakowig.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/31811554375.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/945c8e9b9d6cb5766b8202c876ac5e94/17395107405.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/pobumoredave.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9a8c0da3a1acf6516ddafd381a67c9d7/wabanerifo.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/movorefopitizamasunorega.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/82894851091.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16086aabaa14b3---73913735661.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/faxujajapu.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/18693613954.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/57910af3da3214c778ccb3922070150d/jatadow.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/gozolubozawemonu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7rp1q3u8hv04s7qp5gp10ih8k0/zemiboxebavuga.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/32160ef4d0c77bb7c3636108579c1b3d/sunaw.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/vajedusegoruku.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/27502860809.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a568a598804---pipiju.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9ce7aa321386cfb6ad62554bea5b384c/digolonufegovuku.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d2d7a2acf932c129fdc1d08a3a11d0e8/fujox.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0dec1a2d0---81146352408.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/84008141676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+new+update+in+redmi+note+5+proPDF 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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 17636 bytes
SHA-256: a6109c4cd9fa8a9a94c647c2e8e3480ce9db3816552da098c5a9fbf6f2d57538
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 10924 bytes
SHA-256: bd6e99f280ecc20e4e9dbb9ef15ca047981a85548a006b276f06224d5a6a0615