Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c4d64e29a2c48f…

MALICIOUS

PDF

95.2 KB Created: 2021-06-29 11:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f84d61651c199358fe33f943d351ff70 SHA-1: 5ddce631dc08fbdd3b09e9dd0b93897f1158c91e SHA-256: b3c4d64e29a2c48febe1b903d9d008f2227c37baac145dc596d058f86954e6a7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress installations and disposable hosting, suggesting an attempt to lure users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608344da8b9f3---pesokoxawun.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/eb81ef9fd6cf1162abf61c2e47c544c6/gajokon.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fk6pl8os6hvpqr1halff17jm7k/95686386904.pdfIn PDF document text
    • https://moolans.com/uploads/files/puzij.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n4n9nt3jd8vrgu4hf2o6vnpbi1/vesenaxuluxulokizebanezal.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/jijunobisexotomefevi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/37307090786.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1d3e4396990a6a06405d87256ae3fbe3/sexuvipumolazokik.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/jujemujulilepe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6kecng4suqmqdhbcjvmb9dp64/50595949457.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be98111f9---44409866761.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/65775459931.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609876098be69---38172599758.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/bopuzifida.pdfIn PDF document text
    • http://mosjob.ru/images/file/30054888825.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c415414cd---2599738144.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091467be954a---vulunoxigoz.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f12ca824a641af5ca0d3bf87167b0a3a/ninuxowilozu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc9475284db24f28cef91f62fbf34bfa/dafojed.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/383ed6327f47cf0667490ffa233526e1/46180584344.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f4d545e847aaca2ea1ffcb30a1d8cbb8/37924990775.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfddced3c6---liledadilanerozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=projector+lamp+lifePDF 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_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 17340 bytes
SHA-256: 19ab7b7a5162bf2efe6432e3de7295510452439b87a5647ff398bf46f3dbbef8
font_02_sfnt_off0001568f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568F 10500 bytes
SHA-256: 692335c0eff2ab377d7dd19d3a42cc4ab0af2f736d0ca9d9526807599c0e4c95

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