Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0e5974f20a8cf4…

MALICIOUS

PDF

94.1 KB Created: 2021-07-23 07:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a9993622fba7cfa7cba2b84a9304b1c SHA-1: bf247aad70dd7963909831f3ed5d3b5c9941a8e4 SHA-256: 3b0e5974f20a8cf4c8b80aaa026c250784f8e220ecfff7d8a4476c364dcd697d
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to further malicious content. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic findings are sufficient to determine its nature as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c400f1d6f895a4f2c4142cea47550463/57390331356.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2929ae9699---vegetuduxavi.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jegigex.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/de948906dd97c2cd2ccf03fc571a2e98/95224326726.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b663e2ca---75067164247.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/49948514872.pdfIn PDF document text
    • https://nadamasristorante.it/file/nejogaxaneneto.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/drtt6e3djt90ucb64olh67je45/11230129547.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/vuwijibojidaxi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b546a27c8---tasamozebagararirezumomo.pdfIn PDF document text
    • http://attlas.center/userfiles/file/41241836999.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/71038399860.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/20276085854.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5561c158a90a143493bc46ce35605042/59931427174.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b070f0c621c---78732083779.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4a7f72bb82437e945aa28ebea47c4a2b/80538515434.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/78548647230.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfe442e71---jadomawewe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/48flrqs0chl74nfarfsde63ree/parutisurawiwa.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/93129394684.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/7809619651.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbe8067c3---pivirovurunuxalokivipa.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a5a9826c8fbaf803ff5ec0a3dcc8ee95/32673192718.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a825612ff---nuvuxavofexe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0021216f---baweloralonikibepaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc78682640---11777314589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=8th+class+physical+education+question+answerPDF 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_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 11168 bytes
SHA-256: 4fee44e29e53517b3325ab3467a15fc6f96387150311edbff53ce4bf6b0bc0e1
font_01_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 16688 bytes
SHA-256: eaa0b1fb48f5e87135fa0f7ec2ddde3eaaaff9bcadaca9206b8793c80ffa494e
font_02_sfnt_off0001510e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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