Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a474a0941b4aacd…

MALICIOUS

PDF

71.2 KB Created: 2021-07-13 15:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e1c4c29e3035697247537e3fbf9ea002 SHA-1: 25a20dd1b1b1714d2155f4d9fe9503ebfbe35a4a SHA-256: 8a474a0941b4aacd6fdf5706c7117e1e8e359ab9912f3345659722cedd6f71c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised WordPress installations. The embedded links, such as 'https://queure.ru/uplcv?utm_term=allotments+available+near+me', are likely part of a phishing or scam campaign. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://queure.ru/uplcv?utm_term=allotments+available+near+me PDF link annotation
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e77565e00b5be67e5d2ad5cde918c064/38822555257.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4959c90d20194c76d1daa9a0fa812b22/15371260060.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jukipurafimopab.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c42c09fa17eaf584321ff09e187e145f/tifojoxomepegap.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/959826c220ab1d6fbc06cc022ec1e262/63976260572.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/28595236833.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9331cbfa7---90713960820.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d092e01cc6---21689083725.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0c68e72cd3462bb4235e800af16476be/xekopekaduligunuwavowum.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66514219261.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/u6v05n81hscltfmfeu47bcqqv0/66317243837.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b202983ce81---ditadut.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609003dc22434---kobebi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608407480ad49---razexaxumalisodi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248e5417de---82026820333.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160772d719e12d---93676257758.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/dikibuxidiwuxenof.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/lesomunisokanezi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8b35e4a95a2d10a9b1edec8573eebeb7/gilorubefadulusinu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c360655afd568149ed08fd5f6a86b089/17707339265.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2edb3a8b1---14340155646.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/kufuzujokaterozoxiva.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609546ca43913---jutigiwovigekilawakeb.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea8317705---kujefesurureforesome.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/vizok.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/af354cecd75a9de278e0651e11e2e76d/liwemokozud.pdfIn PDF document text
    • https://polandpools.com/contents//files/2593868906.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_off0000ba0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 14620 bytes
SHA-256: 6eef69b1cb3cae3addebb4ea217cd23d52f27486f4109e96c289bff1efb32e41
font_02_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 10456 bytes
SHA-256: 3c16820dedd0111147d34986ab74b71daafcaa57483ff9588e6933d69c6f2369

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