Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc20f86492865c8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0a01ad76ed05e5f84e693d4b2f317bc SHA-1: 8fb16f11609c7918494cf8f78a3409f1a2f85f04 SHA-256: 6fc20f86492865c85e1c97ecd814f793fa18dffe8d8bb3343b90a6c4d895d81d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://thebookmarkcafe.com/uploads/files/dufibupitunewapi.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071588bc1a18---35771429401.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/24758459687.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6a2a0454---48951236887.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m74tpbr6hdnd0c7j6bs23md1a6/dasodim.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6687455cdf---mogexijonuzegorevibe.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/jewosefatipunifana.pdfIn PDF document text
    • https://soechi.com/userfiles/file/25199551898.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/nusavokixigekasukiwob.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/vajenugerodumagavoguwit.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/sanuvozudis.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/28337883556.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/nuzujeneja.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/77917523592.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/98851589171.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/kavewosa.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///2778927860.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/ragowoxuvujefirozobekeno.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/84951137271.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ea35a544---mujizamidususaz.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/cvn4htc9pg4k2eok1nrvmd87j3/23848149451.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/76430128562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hp+laserjet+pro+cm1415fnw+color+multifunction+printer+manualPDF 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_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 18388 bytes
SHA-256: cb7ca2b8ba3e22501fc5e70c9b7996763022b32165a521b30a0b3e0cf2e41ad0
font_02_sfnt_off000131d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 11212 bytes
SHA-256: e9adfd24ba4d00493a17ba22f7955cf089b6a0dbffbbe2b8ec0acf2b7cea1105

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