Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d0992ea0292a74…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 11:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f7188a5813e02dfc658f98734289895c SHA-1: 99b07d0ad60eb7c59832d6f8e45103a75cda93ff SHA-256: 18d0992ea0292a74c8fa14ad5e52ab2e6a0ddd299d039faea63278b496610d4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://elskenecologie.nl/files/ruwilupera.pdf In PDF document text
    • https://bravo-hk.com/userfiles/file/49366938004.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/44797300571.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dfae25c2a---24990337115.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f26b682e3eaff794a9a820d0adc70842/tiwinejeku.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/61918858537.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/33mtfj9ed4ip326pmt8vs8c263/29487463152.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9abdbb73---72380959816.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/a7h7rp5tbshqr62poepu849dtk/81620342449.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7575e19b---jivetixovelug.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6f77477b5aa9bfac4eceb9796cce26f9/lujowoneridewiwowegewu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d75ec5df---zavakotivulosedixamotejej.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/65916630137.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/d137b95eb9abdfd13f1d3c040c837081/xamowu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22d7569e3---44051901083.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawira.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097fb1c29a95---22992474119.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/96950198689.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/josalef.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807534bb16c---77798288298.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/novefubapilomemebevudoxe.pdfIn PDF document text
    • http://cocoal.com/uploads/file/67455706155.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69069971062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=entropy+and+internal+energyPDF 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_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 17128 bytes
SHA-256: 46990a75b8cd569bbf28748dbf42abc66d47846180dc5b6e1260c29fe4f98ef1
font_01_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 10496 bytes
SHA-256: c486de42af2cfa3e3acfe2f737706552afccb9f5a67b724411158797d59b2f25
font_02_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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