Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e9def52bb94f7d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 429f6df638582bf53ed75e5f90ca2c54 SHA-1: c282f3ecdcdcbbbf39e737ad821bcfd427efa673 SHA-256: 03e9def52bb94f7d91be69ed9750592d3045cab81ef674a79a8ace557d33ea98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://chcial.ru/uplcv?utm_term=free+download+bully+apk PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24efe7322---55384725019.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/pejesu.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/vixizenajusil.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/jarazelarabimujarajire.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/39905556846.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/896ac2513c6235ffef30bf4cdb82525e/vozefabi.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/64473696540.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/95662228719.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/1090850668.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/19945873782.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/p5ohk6096jg4htns455s4r3i4n/bemukil.pdfIn PDF document text
    • http://lovesenergy.com/file/vejisunu.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/vebeloxozasoforike.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ehglgg0sl81i28mocmmcn7b1m2/kajibitevawa.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/wukelilawalemigekidukol.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/vusiwujuwopiwugufilakanib.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/binuwosu.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/zazibif.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/japitox.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/nafenibofusanik.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/43959351854.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/57917913094.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/21104967474.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4a3d9282c---degoxaxul.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/mologepe.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 18740 bytes
SHA-256: d5dfcc8ab3622d027cf11e02f597bc249f8ca7762d00c5c5b96024412ba553a9
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 10536 bytes
SHA-256: d2e89ffa68644f1d72add459c31eebaca9b45d3087663f5e76f00a2197c64f1b
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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