Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b9f3fca435a559…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 15:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d772a41be935a0bdbbd225eff0757da3 SHA-1: bf932744c4c0f0ef9a7bb2f9395e07769bf625f2 SHA-256: a8b9f3fca435a5597d47f51c11ba0169594ef016c1d8a8a68974497c183ee651
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs lead to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farm characteristics indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.hermanosvalerorecio.com//ckfinder/userfiles/files/telonuredojitasagagimufev.pdf In PDF document text
    • http://picassogift.com/Uploadfiles/files/44448221148.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/ritowejis.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c509676ae7---tivolov.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f06bbf856---90920253747.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f092282155c6cee8e722bd717bf008c7/91594943551.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/57121183733.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d15c4ac4---telusetoxo.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/wogitifufakusep.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/tasoturuzanelof.pdfIn PDF document text
    • https://iwistw.com/upload/files/poxepinoxarinivininu.pdfIn PDF document text
    • http://aven.su/userfiles/file/nemizevinegijigijemavotoj.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f06c1b42565ceb04a85f413bf496b342/69685932717.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0f4f7ffe05d9b6db39717f0e18ccc10e/97030243078.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0275faedf96d87f7bf8d7edb769e210f/97536540206.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210813_120513.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4345137d3---zilav.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9d43585d5---2173629185.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/najijemipemibejigujep.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50ce1af7c---tijigonobujebafinopo.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/59843643207.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9bab1a4c4---34796048913.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ad524fd29af9126a15477999d14e4458/judixilag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=new+product+development+cycle+pdfPDF 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_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 17796 bytes
SHA-256: bee834e5e286df528a6ec3ab894e917dd0cc50e737c6f5776656e279ab78556a
font_01_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10704 bytes
SHA-256: c2c8a6f9388ab38c3b9e2b351a4fee49735cde58abf9f16fb9367f35bbf42ba9
font_02_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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