Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac90906fa247480…

MALICIOUS

PDF

101.4 KB Created: 2021-08-03 16:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d38f2edc5f1bbc94c4d30b81dcef241d SHA-1: 8d403bfa7a35b2a3421cea55f285c24e426dede3 SHA-256: 0ac90906fa24748036bc2d31c9ec620bb71d1d83d94ec84e5307be573df15d9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution attempt. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alnadaoil.com/userfiles/file/22086285456.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609957833c3c5---16888754929.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/86270b176a5fb1998a532ccdb1ef5ebf/watuliraxizopopezu.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/35356606068.pdfIn PDF document text
    • https://securitydm.com/slicice/file/78167330407.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f8e7e37630dc9c9c76ee811b57d8bef3/74751321900.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1258937d3b---73014946665.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/25852192276.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d87837c---gekemopapap.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/06f05a8a42a3de8ab353e21e18931093/55909853444.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s01q8d3vlqqqd26f8na6jvf4if/fokajuxu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b6655172dce14777452c95dc0c52928c/48524900763.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a439df0d2ab---62462778847.pdfIn PDF document text
    • https://rajaunited.com/contents//files/zifajukewexavodebu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c217ef19d083c7b0d59ff5eb94b332e9/6619740127.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cc31fd31a1cc3882785098b187cee8f0/19034351163.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/44454027578.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/11039202351.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/tuwab.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/megemazatalujizuse.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/lisab.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/jufawakeniminefafidivu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085562244b42---95763414111.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/1g98bhd5to82q6ooecqd979gu7/javitoverukiziwugumonedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+associated+press+stylebook+2019+pdf+freePDF 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_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 17760 bytes
SHA-256: 245ee0ac9b2566c7e1b1266f5c2d107fd8edcb4627b753cdd6b2e59a1abd1e3e
font_02_sfnt_off00016d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D06 11384 bytes
SHA-256: 5473eda311c8c7454ee43ffda4fcbe82fd51418f461c8a6d9eda3f42d36a4ec8