Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bdf0479de8cdf7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 07:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1dedf55f650dd911c952274a1be3ea1a SHA-1: e59ce08c38736417badd31f2cd80fa02f18516e2 SHA-256: e9bdf0479de8cdf7c2d7b459b6b76e6514c8e47a515464fcfcf5c0f90bc41d86
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://big-blue-bus.com/pics/fotos/1/file/59760284216.pdf In PDF document text
    • http://handbook.hu/upload/page/file/42426856920.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/78909993065.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/kelowexinozurizowetageji.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ujfg72781jm8is0vsk3pf80stn/pofefexorudozovevufufel.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16084679c94a71---18335626914.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/bikofawa.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/pajanedeviv.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27316425722.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/vaninoresum.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb265452d4---wikigibikadolo.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/98174540191.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/welegekifi.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/tamigokegiwiri.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/2932049057.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a74i7v5to36t5c46iemi4o8sq2/11185660905.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xumikikuk.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/8658908445.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/gezofopabajeketusop.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c5b495f2f---xasunafuzenagosav.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0901f0d931---59408185310.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ascqkerirfdjn0jcqji7pg40mn/kepivoxaru.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/56976165551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cleaner+production+techniques+pdfPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 10992 bytes
SHA-256: f24a62ee9c8486ab04c89eb76bf77c6176f4247c1082d7fd905b451ea34066ba
font_01_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 15456 bytes
SHA-256: 690529b021c5858ed85e53867963f0c355872313eeedcd5c6a4046f3ac5f017a
font_02_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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