Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd48863e8edb269…

MALICIOUS

PDF

94.1 KB Created: 2021-09-10 12:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0d7db09eaa21fb14069d81d4064c350 SHA-1: 41ef7409531c2b6cad49108676acc65297cbbc0a SHA-256: 6fd48863e8edb269aa0de6d7cd24cf099c8774a66bdda2a2b15195d761a3e253
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the true destination and evade detection. The presence of external URI heuristics and link farm indicators strongly suggests a redirection-based attack designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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 http://www.ktgroup.co.uk/ckfinder/userfiles/files/91280260154.pdf In PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/56420471625.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/79045746963.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/35758037502.pdfIn PDF document text
    • http://taigesw.com/upload/files/kuxituxuzarinajowolo.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/xapolotoviwexuzebopito.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/05112710555.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/96892649937.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/vibavu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2647f0a7d---veruzolisitar.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613914bbd02ab---zojok.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/45722079233.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/55904287222.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/5684992353.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa71a83ed---77976186895.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/finawanaludute.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/15088315839.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/58663427800.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/11020136648.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53689487293.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/3613400742.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///12787097517.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/38922616341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mastercraft+2+apkPDF 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_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 18264 bytes
SHA-256: 90f867379200942b140d6f87b8c6132b2948bd153f898a2bf7073c43b064eabd
font_02_sfnt_off0001532e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532E 10316 bytes
SHA-256: f5c06b62c0126552930bc1c2023ff66bc98becfefb8db5e3a5733a33fbc34c87

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