Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bf68beea017257…

MALICIOUS

PDF

77.3 KB Created: 2021-07-03 16:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 717431dc1ed014211cd84b2229b76a99 SHA-1: 0bc94c6f666f774d26fb51939299cdb6a75bdf12 SHA-256: 90bf68beea017257d1c4603d20f320f6f53a5f27ca9e82ebffca9eed8f8b51da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=brows+on+pointe PDF link annotation
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c61b79598269033dd1f536919606dcc1/18642924552.pdfIn PDF document text
    • http://labotinnghia.com/img/files/3111219880.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ffcjsjfhpbkkk1f3na5g9q958d/46929836632.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9b79736881de25d6178ee07779108c25/jozabudenusobinaluxuraxi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/33302259763.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc6bbe1cf---nagefidefirujamanetalamix.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mogifumowarugo.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/pekukesujuvojumijilo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/odnl1iv82u87g254qp8ljcghpd/63414997004.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa7f869d53680b8ded25f4eeedf2da47/41307243402.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb0684514a---78976225900.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/1530417be00d1352ae2f574950500beb/65798753174.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/tufekunasuzexidotekegod.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2399c887a9---96388177988.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b32392986d38cfe3fec01f45a00395e5/67540091722.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd67325f3dc---52167639725.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082673ee2f29---mokebuworibozawerexeson.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1e627fbbea8d5705c599069bc1a259e0/1372850147.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/84660497152.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/644edc8b83cba1cb7e791b9edd40cd10/vovituvegusokagu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ed46b3e3fc43b3ab6e3acc048aedbd6f/63499228467.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/29c6dbc7a28c195e658a69f4d7a1d962/degobigavegorafom.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/57450881380.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/fkdopivupf95hifqg148j4u8nc/zefutunewegalokexifa.pdfIn PDF document text
    • 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_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 10176 bytes
SHA-256: e3eb87e9beb85e0ad6e7cca8543ac6bb0df2c451e53e6466903064c7c2cf13b0
font_02_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 17016 bytes
SHA-256: 4e63140aaeb061c6fe907001de23afe0ffd09459daef5fd024bc0dcd5484ff7d

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