Malicious PDF — malware analysis report

Static analysis result for SHA-256 8336b55befefe401…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 19:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6954f7c509a47bfc427f102a83daaf39 SHA-1: db5db1fdd4dda8c2386514ca2775d973b57fa10f SHA-256: 8336b55befefe401cb3626e73cd8552a92585c08663821bef63b7b9779351b1f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, preventing a direct analysis of its lure, but the heuristic firings strongly indicate a phishing or malware distribution attempt via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://okinawa4d.com/contents//files/pekemojolugabowamo.pdf In PDF document text
    • http://campfirewtx.org/userfiles/file/43796336184.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855fbc0f7d3---10957315997.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hucqn6632nlkdmqu43m1k8e0pp/96161152690.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaed5bf93c---29521463250.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2720c390cc---xufaxesabar.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609841efdb099---20080516505.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/75809365812.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/sivibipobaromor.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ovcpg2cvb4qhj9sho9mg0inajs/viwepofuraromasobofike.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf9280a84---batekevugironenuwunudisu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5f6adc3c---77758830936.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/rarezi.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/bebixipi.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tpd5j5cdf31n6tol008152hju7/91679152514.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f0f92a3b9---98435024794.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/lezuwaji.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3aebd576cc---nafimebokesikagujofagiduz.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f4a60fdf7---88286665665.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/tulaterejosa.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9unahis20cg2nnjgllkgd90p7i/xuxufubibuv.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/40862625076.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/kexolotolotozukitubilubew.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fb2b01dfe88c14071e112cee7759377a/butezutikajalodulebavit.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/c6pnughi0o0ukkemafn2p786t6/5553519921.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1154bedb7a894428af5563f35c50e00c/nabonulozov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=solution+focused+brief+therapy+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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11148 bytes
SHA-256: f3be2a931c42e2fa1abec8e95b343768443695498d3263ea4a8183aa79f1e1ee
font_02_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 16864 bytes
SHA-256: d81daab60fc0e822f0ffa07aa177d6bb642aa56316d98a6add6ce6b0fe4b3e73

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