Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8c235becfe384a…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 13:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b3a8ff8861fe4afd7c34faf497c5373 SHA-1: 8e935631a23adc7b7835a5defc424e496d65b1f3 SHA-256: 8f8c235becfe384aa40362da03f35a376d2ac9811b417b290d1c4dc140fa625a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://hilltop1976.com/clients/24685/File/vonozejesunovaberimid.pdf In PDF document text
    • http://orderkiwicafe.com/uploads/files/xowijejekubuxotofi.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210606/210606123005894103srx7mz9t11jd.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f5db7e0a---24004930689.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39f06e1960---1768960882.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7vt0vcio6im985ujgsdrqkn4sq/wazenolanofolu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/punonasubiworirofizofegu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ea0b8a25e---lapabobubumofebemuwizag.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bilivegewapawagudo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b0fb909438642cd1f2fe3d23e43c2a9c/xirubelamopofanuk.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/zipokaduk.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b254e26ece5---foruvoluzozub.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/vikutuzufebozizovon.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/50942365614.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6171746d7b082903ab1bff681dca91cb/33451067894.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dafige.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f7626b31a264bb84899f915898cc7449/dimefuwuxiromudawivu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/bofusefigomuzodawusobupu.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/56656408841.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ca369f2c4807ab3669abbc244536cf7b/lozumirokelitigemixeleg.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/aa0e94ff091138e790b8334402361b43/66008828828.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/gedusizivirezegi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tojuzovetubale.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/67870578793.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd30vdkfkgp7rn4g3jhah0vlak/62877047518.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d35b0aac216---78451463226.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/m62erppvv0r73gko8cuol8pq93/dumifopemetuzojititesit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=haziness+in+chest+x+ray+meansPDF 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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 17168 bytes
SHA-256: 9d33d3f3858829f2d167452faeb5c4737b1ca80b912f557c880360bc73eb4489
font_01_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 10596 bytes
SHA-256: fbed5cbcb4b0ea28f613accddfb574b798d25a82cefe60286ac76d5fa5061abb
font_02_sfnt_off000137b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1