Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dbd51f4c17bdbd…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 15:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ac9217e065c2026bbedae7681b39c2d SHA-1: a90a0e115ab345baca21dcc2f9bb3080a568ef87 SHA-256: 01dbd51f4c17bdbd81830f4ef1925e2477e9c62514944c5eb2da96a5f6cd61cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, identifying it as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely intent to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://network-italia.it/file/3782886054.pdf
    • https://jgranit.pl/userfiles/file/gonekotulabokirag.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9ovb81355le4o0ac10df923s93/repoditisaberekopejepupi.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab112e3c9a---zokuxodojatorinige.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9c6119d2---53163811335.pdf
    • http://gdbchurch.com/clients/43262/File/feruduzotetusez.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83412e2a65---81155649070.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610256680981f---wekofuzapul.pdf
    • http://zwickerfoto.hu/_user/file/ganiwetewatibamunalisute.pdf
    • http://tinhdauvietnam.vn/upload/files/matadimugu.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozibazexewaka.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39b8493cf1b024d8c254492a1bc58f2a/nivutud.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r7vdnqrgor54qncr9v3vor8l3a/43902035590.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/vujitikawibisigimazutuwob.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079251ce8ada---6497950825.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab4ec21675---36203581659.pdf
    • http://alisawedding.com/upload/users/files/fibivaxofosutuzaponawisil.pdf
    • http://mhinflatable.com/upload/file/64358025975.pdf
    • http://dorrstrechy.cz/UserFiles/File/63112139581.pdf
    • http://goldway.jp/upload/board/file/34881114596.pdf
    • http://uniroll.pl/user_images/file/65687219493.pdf
    • http://www.pvvc.cz/files/zaxukodude.pdf
    • http://nesthomes.in/userfiles/file/wivisowarodalisewenizad.pdf
    • http://bocghebinhduong.com/media/ftp/file/senefuni.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160994073890c3---53439746865.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b67a51b7---19627294047.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=good+morning+wednesday+greetings
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c690.bin
bfde616118e04160c6661237781526d02e84ad6d5b5afad8c6fd5d103d8595ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 16508 bytes
font_01_sfnt_off0000f10a.bin
4b6d8a2b316569beafe8f134af2b0c9d569d87a78aabd41e6dc21372ce96b39c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10784 bytes
font_02_sfnt_off000109c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 16792 bytes