Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74a9d04c7d1af0e…

MALICIOUS

PDF

108.2 KB Created: 2021-09-13 13:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4797bdd0495d69b62e9e9734bbfb9e9 SHA-1: 73c09af7725b72c00db888e3cbbeedbe131b59e8 SHA-256: b74a9d04c7d1af0e65ed14b27327d11c75153480a70c26f681541a393d7e9915
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pixomot.ru/uplcv?utm_term=robin+hood+story+summary+pdf PDF link annotation
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370ea8b7276---pakutovokefuzol.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/vusedovebabedepit.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/18087778246136bbbadd157.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/43852544079.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/bupowamapalidapexokoru.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/41210775987.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/55018607953.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/274350723.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/wobodizilubin.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92b6d9d23---tikejifawugusomozulil.pdfIn PDF document text
    • http://alptw.com/images/files/penezesuz.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9j32fnuhnnuph1uha8n44jc0e1/lijegebilenafexumotuluku.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/ketasefinisigugevodibisef.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/julubatevelu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0441b02a4---datoninufetimojigumago.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/letibutelujamovo.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/28049790307.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vaxeneg.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/gerakigevujeruvu.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/tinovijafikiduxapajetagep.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/gonifexorepefepugalide.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/munisixelabajewotewigon.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/42318015078.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/9560028790.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xegurikitasoperulu.pdfIn PDF document text
    • 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_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 10984 bytes
SHA-256: 2878478c9da7ac2865218e34bf677566669c29cfc3588056a99549adb07de421
font_01_sfnt_off00015aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAC 18864 bytes
SHA-256: 790deaf77eec9ab61c7bb0a3862cacb868314742a8b33e3d8fe856c450671588
font_02_sfnt_off00018ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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