Malicious PDF — malware analysis report

Static analysis result for SHA-256 727290259c213d07…

MALICIOUS

PDF

97.5 KB Created: 2021-09-01 10:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6044b2c36a5e3a58443569b1f76e581 SHA-1: c5901e26e697a1c6b5fc0b000a97c7d0f1e0bef6 SHA-256: 727290259c213d072eb8fd68a33ed29c78bc1a5ce0aa2332ac0c4650577abeec
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the PDF is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=the+perks+of+being+a+wallflower+vostfr PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081291072e3c---36522087632.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0e4163e04fa74d7380729fa8d834b440/77884867495.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/57c0d1ac1ed522f43b7f6270bc268702/furuxuresabuso.pdfIn PDF document text
    • https://educhina.mn/editor/files/65905307385.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/lowabugoxetotuzabonajurib.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16112cb68ba8c6---vomajutotulapidivi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/bedadaduwimitedabibakude.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/15378685395.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/93256937792.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/75927765409.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4d8ae6e951481a785d948f362c9f105c/45253250707.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/16e32888de27a5065d22ecda11ba29d0/77817130934.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610fdf5f16d17---xumixibav.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/39661498752.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/60560391649.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/bubefol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abec04c880a.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/sewemobetaxupuxoma.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/jipejijasolekux.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/weridog.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/16236827492.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/50634302894.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/88020688217.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10248274287.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_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 20920 bytes
SHA-256: facb53b9d414ebc56f8a6e111769ab2b02143bd22a3710c7b25a47228707fd84
font_01_sfnt_off00014620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 10984 bytes
SHA-256: 462e6de3f0dc28b6c23021ef0cf2089c1158ba62b56d2a0fbac0065e64f9bc56
font_02_sfnt_off00015f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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