Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc3e9d2bc29b84a…

MALICIOUS

PDF

91.3 KB Created: 2021-06-30 03:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 26e076a17539511a177e77d3eb9237ab SHA-1: 077fb9e018b774c35ac7653f7464c3d3731fed29 SHA-256: efc3e9d2bc29b84adcfe6565fe3d8aaa35bf8025adc061780b63c06b89879e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=2009+acura+mdx+user+manual PDF link annotation
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4e4f09bb---18014843917.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a261a0e5346---96403739428.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160949c2bcd850---karesixazobevolizat.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/tuvejemusifamuzukuxamas.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/300ed1e0830e0b0712923f5599677d4a/bibabapasaw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc971e6784---32011204740.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tizazefowomexaxeri.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/c5be537ca5a8b793af3b5267e0d8e9eb/7013402195.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/l11jkjr9bslfdkkqaed6s4dtdd/54580834088.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6a5e54d8---64225819847.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a750bdc1174---4226528876.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/94999055773.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021060906291941.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/dipomivizivipizuximaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7fafec740---52179838361.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/vitufamave.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/farev.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a4918b65---defij.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/84185227100.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2606a8645574105ca4ce7ab772298382/wufovixek.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1643494d---37489637193.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97227a8508---tarolu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nudegivurafoteku.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/batipinubetirev.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/49545927059.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/75a98724860d9556093bb62a2811b874/nivuwamumoxamakopipoza.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_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 17760 bytes
SHA-256: 6371a27c8bf90bd8106d560f1c9a940b48801db4fa94155b541844ef2ff6a402
font_01_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001475c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475C 10736 bytes
SHA-256: da59378684e7d4f9fe128395dc11d8c6e6a49751be0226b901b2e6012a67ac8e

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