Malicious PDF — malware analysis report

Static analysis result for SHA-256 540fc16531cb2d78…

MALICIOUS

PDF

91.0 KB Created: 2021-09-19 02:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0a8804d3cfab60b21431a7d83cac840 SHA-1: 1b12e21401af23cfe85fb63f5918bb7e3372743f SHA-256: 540fc16531cb2d786b241706750e45de2746b4c9efbcdde99cba9b14a85eeb95
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous unknown URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://poledance-chrudim.cz/files/file/wiromakapoligab.pdf In PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/49912224905.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424dc8a2b18---96703919977.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/susar.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/47870193802.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84966364601.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nrmd35pk0b2lbrb4bld1h8j5hf/87175146232.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144442c8fe05---nuvawixenimejiwotona.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/vakelukokapof.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vunukel.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/34506686805.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/kufagos.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/89293987187.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/328faa8a7bce95e038dbf71eb363f250/55068030788.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/56051052898.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/27939672234.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/facfaa5f45676454a44a8f2c283d55aa/zawaw.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/tasisopenituwovanimik.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090607282847.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/76454217009.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/96069674386.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/savidabad.pdfIn PDF document text
    • http://fnathservices.com/upload/file/fixuteve.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/63377140169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=toon+me+proPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 9808 bytes
SHA-256: 70579b5dd252440350f61646c0302f4f4c284f9a23c7bc5ca724d4b583a5029c
font_03_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 18560 bytes
SHA-256: 852627d0608aae2552212b5dcbaf846b69d97e4b8c786be6a5ea75c4f34e9183

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