Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b98d2150cd4879d…

MALICIOUS

PDF

92.8 KB Created: 2021-07-22 11:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff2273c14c2c4c5afe0559ceddc0f77f SHA-1: 07a8d57d239957b689df79b22df3132370afd5f7 SHA-256: 9b98d2150cd4879da6421c6d20990b703a2b63f0b8fea1c00d8c9bc305dfa2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan activity. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e95c106b0ba---tipapabor.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f66c696e6a541a057f6384447fab7a0/jumozepusixuf.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9c76cfa430bf1e4e9bcd78dc65a91cae/11382276266.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4da91092cb0b6651aa2391e227102698/robabegegex.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16085cef60b425---44983235995.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6171df1972aa4f7ac3a620dbb5ee68fd/66611796688.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/38376073726.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a3098103c7fbe865b4a360b43f25e3b9/nepavuzikixodaso.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0caaf034ac---xopowawabuxenefijilovek.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/53612344585.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/lurl6chhmkhg11s953qig6njm5/58196107835.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/59124340071.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0eda06f9bb1a02f57267def750cebef8/41170704637.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28b944926e---52792813297.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/bawedaregomajosanodit.pdfIn PDF document text
    • http://amdind.com/userfiles/file/gozazesosewomufudomazeban.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/28167639914.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b79e9a5c2---jopuma.pdfIn PDF document text
    • http://jaatkinson.com/userimages/3820769828.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/13722304682.pdfIn PDF document text
    • http://meta-min.com/files/kogezugikuxivevofevudar.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/555fd68a60a20a36dcf37f12ff4adab6/33517682327.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/dibedokobagilezeje.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/32734768546.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a8923128---10772340299.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8na5a01fstjto2ucl6np55tpl5/wawizusabanetevagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=14+march+star+signPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 17292 bytes
SHA-256: 88a1df991279ec617d00ef85ca24cc45446d9a5ebddc423a85a10d86b68fbfc6
font_01_sfnt_off00011f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001376e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 16160 bytes
SHA-256: 6a4c2dab62f2480c9ecbd41767dd561d262dfa40bebd193f8f02621e9af36951
font_03_sfnt_off00014cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFA 10412 bytes
SHA-256: 73f71fa336e695100713c0e89c91b5b1dda571275e0b171b7e53e16a101b0999

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