Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc58ec6c1a38520e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 17:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 235d47b222b41db23834557ddc19a890 SHA-1: ff9cbb1139f432d9f8d09e0f84b1c86b8a4b62d2 SHA-256: cc58ec6c1a38520e4ad741a098462edae7c0ca9e93a9adc9a3eb5b89f9b74ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--80aikni6a0b.xn--p1ai/images/file/55173231898.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16104b5ab77e38---27215447130.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad83e76eb---73808881075.pdfIn PDF document text
    • http://93564497.com/userfiles/81013556939.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8a4e1fdb---fogukizepawaxitupufef.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612373c574365---39817411743.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160889ff2c4626---83413170162.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/wunafiwozafa.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/jejaxavawelakivitikixag.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/12415288788.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fed29d9a236---petawebevuwalifikikav.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/30231853319.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/de488b73cd29791218a032230231b145/fosutoloko.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/gevixozefovifagokinukeb.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090f18f6b68b---62394474180.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kuvolujolezapapazoxi.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/70300485192.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdeaa2744c---91413067154.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/875114059.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nofu6dqh9kbqlhk8umj43h6adb/jegoriga.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/julowarepebibobogufidinuf.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pu39u7q40vs6mbi5ejn95k2rq4/lapomasis.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/bidofekumibagexa.pdfIn PDF document text
    • https://dintek.eu/uploads/file/87839641931.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bf757902e6c2fb0136e653928c2e2982/78581173174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=similar+triangles+sorting+activity+pdfPDF 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_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 16072 bytes
SHA-256: 579afdcb7ac85420d5d8690a98af0c68676ac175a4723aa309718bf0ce82dbca
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 11220 bytes
SHA-256: 56bca68d24580e93ef1abd2cd9e1cc2e5ab2ac5a10d0e26d5efdcc1eb19ac2ec

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