Malicious PDF — malware analysis report

Static analysis result for SHA-256 5702e50a21fcd905…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 21:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bb53f69df49728fbcf8cec8d805f655 SHA-1: a6f9250887d97879fc339edab9d92b010535367b SHA-256: 5702e50a21fcd90597891868f21fb6325cf241d405f1e900094d401b8ad54211
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. Heuristics indicate it's designed to host or link to malicious content, with ClamAV identifying it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://consurs.ro/ckfinder/userfiles/files/wufuwifejufufiz.pdf In PDF document text
    • http://zhatuogz.com/uploadfile/file/xukagutidulijuzasonubu.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/diwerapofivavorebosafazum.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61346A7095743.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/kiwawoxukopogunogeso.pdfIn PDF document text
    • https://flomogroup.com/upload/files/redulefunadazatebewofu.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/peguvofeketudomupobes.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/sejarelopol.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/73770508714.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/mepukujisedurebivemetuni.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134777dd39fa---23316001946.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7c4f1a7b0de4419a714aeb787d6c5180/51510029992.pdfIn PDF document text
    • https://biomisszio.hu/tmp/fifof.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/nazoderanategebuzudavi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d21595def3e2f402e4b458a77b1ea48b/72013040968.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/bapusumuwipopidomuxu.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/pobilanemema.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/letevazobalozewafenej.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021981925366377.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/82942729397.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/66236703618.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/fowozipegekeza.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/vafafisu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754e4be181---75434382643.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8640e275dabe4bb829442d3f21fa6458/bowipuxawufol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=refugio+de+vida+silvestre+pantanos+de+villa+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_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 20504 bytes
SHA-256: abdf1a023eadd5af51dcb300b1cfacb764ec3270adcf6820daaecbbb7e3a8101
font_01_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 10884 bytes
SHA-256: f0c23d58ffbdb2d1698a9de005e91bc43f220d86af83ae4d0182fff74c19960f
font_02_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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