Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef654682fffd1f31…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 16:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6de3fdd8109e51988b113cecda78fc4 SHA-1: 8d0a365cd2529b0ed17ee2a33f6bf4bfb317f443 SHA-256: ef654682fffd1f31e3def5bf058d934f043ab00f0b628b36c707982623273654
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://canphantich.net/Images_upload/files/46641434754.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607221caad0ef---72690654462.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/bokugenexexazuviv.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hjaoepo1cc509i30pjlsoe85cv/23058140712.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fazovefigu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/75861aaf714da55a345e8058d1dae443/9166303753.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/fazaxetemizad.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/76796968000.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef46a27ed9---33196272731.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6giio8vuv8kumpmddnfq2jehgt/7495191756.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/72765889504.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/67042730931.pdfIn PDF document text
    • https://menu2uplus.com/images/file/42300566800.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c05a879b---38978398868.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/69022180995.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/10803319082.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe5b4b660---10500622389.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/dikigo.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/venaparorixid.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/xivitebofexafewurerokef.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cbb7bd1c3d648cbce42b3d16eb6c37c8/82516252006.pdfIn PDF document text
    • http://egonseetour.com/FileData/ckfinder/files/20210616_2753CEC0D1925E8F.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/67450221962.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73ff3f465---dafivesesipuxunu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fd4641b98---79536314883.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c6e9998cd2411fb91a5751bd0dcb864f/19392707130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wow+wotlk+holy+paladin+guidePDF 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_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 17404 bytes
SHA-256: 9d9821781c9339f4d59b47b5b351292f16b765b7336c40e2345f3bc2d439077a
font_02_sfnt_off0001319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 10788 bytes
SHA-256: c484d5a85c7f3b1449a4100c0c501916f2fcadff227679bcfe133c82fc9842b8

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