Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d5bb5db602d2b9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 22:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a72eed65c19b8221b5bc6e8705897f4 SHA-1: 5badae3b462fe8ee2adafd1ed4065bbc1d6291b8 SHA-256: 31d5bb5db602d2b9b67c115927aa19a8f8e3dfea23aaf32e4247552b82c19ead
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO purposes or to distribute malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0ba4638b---juniza.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eac160cc5---75044770967.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/97425720178.pdfIn PDF document text
    • http://n-zvuk.ru/upload/file/66564690613.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/10405224726.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/ladasigirinuf.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/vagezis.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b412148f8---sizibolozibeb.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160919c9563989---dunukuzejajurevoz.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/liwetelisebe.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/97221322528.pdfIn PDF document text
    • https://andrejc.si/files/file/82827663010.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a108879ca---98520230506.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884217bcce8---4343896708.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/27907315488.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5e324da65beab7a0a3c54d683a95e584/jofaf.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1a83240e---zenutivavijewazivaj.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/46851473668.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sfg7p36cflobd6erbrkm7un2fc/59241128420.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/5119368076110eeaf21477.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/warupowebomodigumozok.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/deviponunisidirekavirum.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160812ecd4b618---jepawonakuferodatisobik.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/dokinakojoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ap+calculus+textbook+answersPDF 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_off0000c05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05D 10776 bytes
SHA-256: 396fc46ce6d5b08e6bca4484d0fd3e6d455794cb97b9dfa3067e82e9094a2088
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 17244 bytes
SHA-256: b1f14d533eb5b7d76ba003c4422b0667a0124ebbf8c1aba03908304c497bac4b
font_02_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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