Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c42138a2c0acba…

MALICIOUS

PDF

142.5 KB Created: 2021-09-01 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d58998de999fb356cd9c77f9d4c05fcf SHA-1: 916b6dcc22e94e12a5d85018253c9376887d3890 SHA-256: 60c42138a2c0acba70ceaf7a466eecd6ca9fe4f4ed86ebe4158ac9ddfd370bb8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ate9r6ee6o8gpg25ns8hhakpqh/33640385745.pdf In PDF document text
    • https://eltechma.com/zdjecia/fck/file/55727708314.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/68486194172.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/foraroduraxibizib.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/zuxifu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wodazeduvaniduguxosapa.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/feferolilagavefetufu.pdfIn PDF document text
    • http://mp-journal.com/media/file/labagap.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/julepow.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/26190193385.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/dojevo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87d176b861---91992339215.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/38633049241.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/luturi.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/jekep.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1c0ijbrb8s2kptu1qmahsmnrc7/livebofigoraf.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2431f0fdd83abf7856c325f8312af333/47073868949.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rejexulawatabodibe.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f1f3179d50755196ea70ac9b365ae2d/xokosurajujukuki.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/18718676312.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a2f8c68d---17112095422.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070aac87d405---70602214013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=persona+5+ps3+iso+torrentPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/xamopafonobufovafi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B39F 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0001bc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC2A 10508 bytes
SHA-256: 078ea7b40d86f31deea980bd4a6f256ca16ae4663e59888239a1f77990553712
font_02_sfnt_off0001d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC53 24348 bytes
SHA-256: 2221456d0e7cec8c9ccceecdc72e5fcdd7a2f53c5aed4ec716b65a07125b9ded

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