Malicious PDF — malware analysis report

Static analysis result for SHA-256 259ccb9fef508f51…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 00:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edb2abff87372e5712784a6f1f7418bd SHA-1: c7a96ff7971e15fc66631c8d848747975b48b877 SHA-256: 259ccb9fef508f511e6fe86bf8d6dcfc84445fe6fb74bf998b43fd62bbd3f812
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://roweryelectra.pl/app/webroot/uploads/file/162812502953.pdf In PDF document text
    • http://technoculture.cz/admin/upload/file/ruligosonaminimo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fawonebelupamekoporeserow.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4j1l5rbk5c79aicro6s5d923d0/76587851415.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/36700369060.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/30826133166.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/66658981882.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a96b3609143---ziwefomufu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1ef4fb80---limizetelorimuzadujosevav.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/42335529911.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/mirinutabanuwar.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/97744504578.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/cffqcn6pluf5s1a07m5opkcrth/61304444334.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e33d093e67dda8ef2b6b34080cf2e6db/85328881241.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/bmcf5mdqvnifiseogpnnraa64t/jugijoralatixipeloxeweve.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/c1vpi9gdmucv6nmjvbtriuqv7l/92803455171.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202108250259391260.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/tejugeme.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2563f54e0a874b9be5bc1e16b0099d56/pugaliwora.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/20644873044.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc87489aef---26462525228.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/s85bnjl8ga2v60sfqkjvgt2ik4/xanoxasuzafuwotan.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36389b6b60---vekawedizomofukovezutesi.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kaseladiman.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160985c5ed8bdf---xopononawukebego.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/vamopod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=genmate+generator+manualPDF 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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 10328 bytes
SHA-256: ee0ff92e6b30583fdbf858a847151526ce99c3daaaa9bb20dc02c17eb1f4fc3f
font_02_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 17700 bytes
SHA-256: 1c5f6aebdd84ca88b0f4587768018e8142379a35fc8834666075c2558a965adc