Malicious PDF — malware analysis report

Static analysis result for SHA-256 901a834e3d86229c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 18:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 478dccdacd3c455fa29efc1417d85be9 SHA-1: 5e005ee7c68a8d3b3097bc8c99dd4c493363c822 SHA-256: 901a834e3d86229c89a6ac37f5472ce68a24232b0154baf6b0621f40880dd7a5
164 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=3d+racing+games+apk+download PDF link annotation
    • http://webinaris.blog/ckfinder/userfiles/publics/files/ridowokevoxejew.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/bekotorim.pdfIn PDF document text
    • https://labelmarket.eu/data/file/rinigovebawifufexurised.pdfIn PDF document text
    • http://byecook.com/ckupload/files/95104791786.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/30382237609.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/3016746517.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/45423216840.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/fuwavixawimufirodevap.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b971819088---15479552136.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/76322489480.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/biwadiwegerotuxokolup.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135328c4d754---7785451734.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340963d6bdb---kizedavusejizuf.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/73861546393.pdfIn PDF document text
    • http://fitviewer.biz/files/file/3288232839.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p44ukuk7u6anflrdel8rj7c4gc/62458493516.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34951606310.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/bosaniliru.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/52203553779.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/pezasasi.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/refuzuvavadufenofomug.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/49895835177.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/ludugunapov.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/kusokemufaxep.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/13165331870.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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 18160 bytes
SHA-256: 11e9a410597afbd89eb7e59cc29384792d516154a3df3c83ebfe6d969ebda750
font_01_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 11012 bytes
SHA-256: d31ae77baa03d4da55c903d36c9041847c06ba36852eeae1e25dcca2a12c40a2
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1