Malicious PDF — malware analysis report

Static analysis result for SHA-256 f089a34f73ea7875…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 08:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba4f897e00ac6ea9c8401f318d9f7d28 SHA-1: 5d7e3bee281638758891bfa20266ecbdfadfe4bb SHA-256: f089a34f73ea7875ee37e0f4761388247e481f6819d3ef1744101299295791eb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is unreadable, but the heuristics strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://krisoc.ru/uplcv?utm_term=to+relish+meaning PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/05628f36d8023b5cd7bb057602c9ca61/wopafigagij.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j7sb6ugu8h9q50iqe3k4sa7gup/niduguxat.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e912cf27c7d---zesezejumebuse.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2ae85cf1---28749020415.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc364655c47---voxafi.pdfIn PDF document text
    • https://tmtteks.com/files/gulumazalamipa.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/31647658200.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bltm26jpbvtj840eb3rf4cjt1a/voluma.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2edc812c8f47dc1b472c33e6c0fbcdd5/zozewokefegawidujewiburiz.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafefe9c0c6---70478726616.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dd4661924---61451643462.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c72b36b33a---23282419865.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/2310712215.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/kelefekimipulaxoluvaz.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/32660663237.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/39945450bff40747c936a1d1dfe904ea/24721623213.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b247c61804c---47899721683.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/36b3819a2572251b3fb5d1aee2cc40b9/xoketejusidiva.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/kulelapofedixejomej.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7de56d1c---dajod.pdfIn PDF document text
    • https://artenika.pl/fck/file/97242632473.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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 21316 bytes
SHA-256: 9f164254fe913ded607f2014092879dc7344de3f4b500edc9a9ec987ffe32435
font_02_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 10420 bytes
SHA-256: a3200564847404a7010ecf7a58118f34017665b5d90873c38dc6203b6fdd167d

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