Malicious PDF — malware analysis report

Static analysis result for SHA-256 815fd76b8a27e48f…

MALICIOUS

PDF

96.5 KB Created: 2021-08-19 09:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9fbac60449a1ea6a3d68989b7d60d8a SHA-1: 488becf7cfcf8d0a01c34fe0f6cf9f30552e8743 SHA-256: 815fd76b8a27e48f0d81d0785a7e86098145156e43f21e0cac8caaef30f69d81
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised WordPress upload directories, suggesting an attempt to host malicious content. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a malicious intent to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607820360e0bc---936211766.pdf In PDF document text
    • http://netdepphunu.vn/images/userfiles/file/87389105648.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/zudimezasir.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6437d2660e---mawefisulesitirigowoxurud.pdfIn PDF document text
    • https://lemanssrl.it/file/95319708442.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/32c3a2f14c29689fcd28bc525c0ee83e/vapimebanipevalipunekos.pdfIn PDF document text
    • http://ewtch.com/upload/files/49764099312.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/989dd53ed60812f986c6daa79f15fcf9/71923513968.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/49066076624.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c90cde0cd3b---90809943450.pdfIn PDF document text
    • https://ckmandarin.com/uploads/31472309238.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/79156112015.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/99655690011.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/titezux.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/65790710699.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f836b72b3---45387550583.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4a7c2f66---71831036880.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb8b3be868---sumofofuputobuguwefaxuno.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/pabopefejejezelizovumi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/6db037be78517def9876df069b583455/weluponusujetuwiwu.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/21264987938.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zogenozote.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/wopefinowamisija.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6e3b5cbf0d6cf171842274913d40a492/degulogusolilubugi.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/38670113980.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dff59485ca16a939c622acea5c7d2417/xasinob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=codes+ghoul+bloody+nights+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ed66.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED66 21308 bytes
SHA-256: aec81b3c9665fe5554894a676afcd30b93b7ffed4d10805d3e078317917dae7f
font_01_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 10892 bytes
SHA-256: 97046d08fe09476cb9f066e604369534a9603346172f3ee56b9d0764d30ae968
font_02_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 18332 bytes
SHA-256: fcc8452d79352f0641e728425b51aa98c2a5ac99e80e6988c5cb673fb4107da9
font_03_sfnt_off00015ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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