Malicious PDF — malware analysis report

Static analysis result for SHA-256 569f3c9734ecb403…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 19:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eefccf166b34feba5b3bd5f74ece83c1 SHA-1: 1b0e009189f5612cb8d30fe42450cf5b55364ff0 SHA-256: 569f3c9734ecb4031d4f7a943ea562104b7048ca790e6202755156e091abf9bb
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV and ML classifiers flagging it as malicious phishing content. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://mexvp.com/ckfinder/userfiles/files/denokuxetasibevupogav.pdf In PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3971cdbd8---92145359319.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/od074u3aj8a8ojod1s9a551p51/46737389403.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/78428219717.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/13941341373.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611950975fdb0---reruwo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e0402bcc---fuxomegugufuvosuvizupeduk.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tovukanireloxobirezazidew.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vitatijatilo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f55e0e717e0---97128793432.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/samafowiz.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ff9f07100ea9ad9cb94d5ba92b2c4966/vukutekunotepiwumebo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/nudupaxotabazakakubuwiw.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/92ed1cc0e04b536f09b800a6fd33a42c/bavarofumuxirom.pdfIn PDF document text
    • http://mesterek.net/tmp/97635047067.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9e9e69c9f28b6e5d4e77b3d3d48109aa/97357001516.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6eb427affba2670152d245cc370efa72/73421369773.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a283c53b2a---86450901484.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/92815793885.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210721_81C54C36E74685BD.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210812075353.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/gesenotukapolukad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pen+out+of+couchPDF 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_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 16836 bytes
SHA-256: ff7e93c2f9750de77640c7c2e05a9e861905c293c1998483b54d1bf9a6c5eea4
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 9964 bytes
SHA-256: 4135615119e6d1e3b1a56823a76c2e23be7fdfc104f5ee1f0cb57e6d6a2867e9

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