Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccd0cdde88c7550…

MALICIOUS

PDF

92.0 KB Created: 2021-07-08 00:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dcdb2e8b18d536eaf36e3ce226a2adbc SHA-1: cb4df4cbe73700420fb59799abd6a2a3203a07f0 SHA-256: 3ccd0cdde88c7550b74b2dd0103d485b22b837c9222f28738b6ea4e8b6a22445
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://modero.vn/upload/files/nupofoduwimatebureriveloz.pdf In PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/8539760092.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec993b2a8a---nazeketose.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/63700032979.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mtr864dq43cm18otr5kaccqj2e/fizatumidaguwonix.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mmi41gp539d8mg2dgojp5d3lr1/82269564518.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/jadazugijedatogadumogor.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e469157c54---41187702590.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/49df30a0eea796edb54570167039d741/foperanaziniper.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/97491940326.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0954bb98c1d11e0f679e331c6ddd9bc1/vadijox.pdfIn PDF document text
    • http://splogservice.ru/content/file/sunibato.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vezafasenelutagag.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/totivorinikoruvorid.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc1d1db2c---92770694123.pdfIn PDF document text
    • http://millecolori.it/images/file/16781030254.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1047ccd8a---gitikekososopojaje.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca47a0ed04---91164935096.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8d5c45db8ce55a8fd3529d5b66b5c541/mavedafolafezigurebafijof.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c4f62bc3d3034a9433aaa06943d45ee6/bufofe.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/dogijodapedugexaji.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/jubaxisejafamigufaj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097dbe31a1b3---23826196460.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a524ceb9aba394e9300ab970c55b14c0/neriwugusaxake.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975ee9af97---nuxilape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+meaning+of+invaluablePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 17044 bytes
SHA-256: 1200c16f74f4727febf93c5ca5493054ea6cfeed371bfe18da02328f2d480f21
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 20368 bytes
SHA-256: 5c1072cefae5316d3ed12f5ecc16fd266dfb90fc0ecf9a4f42c0b140565daab8
font_03_sfnt_off00013d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D30 3112 bytes
SHA-256: 10b8ea209edfd4e302bffbc87cba1be74406ca1e8184149554a694ee05697144
font_04_sfnt_off00014995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14995 10564 bytes
SHA-256: 3a53e5928dc05a3f5b77c097663609ac8d175bee17be708546f35c9340c5279a

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