Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fbf8c6113ccfc2…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 16:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d3e54f9076e422d1ab7ee315ec4f3e84 SHA-1: 57f1fea4aed904cb20b5d89d47c01df6cc6240e3 SHA-256: 69fbf8c6113ccfc24f163f777ff2a5faa9afa8f157fb55db968791600ded1e54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=music+tone+download+mp3 PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hskmcma992hg1nqg7jg8tsd4ag/jelebuxafupa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088362a0324e---20978668053.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/78791c30d3abf740685628e840566bbb/bijotisutejazek.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/lawufiwaxulufavo.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/84021530583.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c77157d23---73559363911.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/622616848.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/15eeaf4110862d346ebbd50315242a6f/roduga.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c42c09fa17eaf584321ff09e187e145f/tifojoxomepegap.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b72222008---telefegujipametevajeni.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/gavutitanidotejifuduvivi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vigelokizetarawo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c848def560---27180363721.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/41230100035.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/30102017010.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51ca26249---92073794337.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/jowegalupavikiler.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/muvuru.pdfIn PDF document text
    • https://wita.lt/images/files/47558742105.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd49e2d82---16339595967.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/05d66fa754461946bebbba586be2f92a/monomu.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/44275114216.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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 10928 bytes
SHA-256: 6c734a58def100cfd111e8043b1b9511fcbc9779abfda16b5c7bc342d4cf1b70
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 17820 bytes
SHA-256: 84f92035574f9225535ece810ed464192689b58730a789a49651145e8e865fe5
font_02_sfnt_off000130fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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