Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5f7bebe681ea46…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 10:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14cdba25891fae611bdb6764425eec57 SHA-1: a5781ff56861d797cb1ba4bbcd0a16e89084cf95 SHA-256: 2a5f7bebe681ea46a703614a57c2c666fc7e65758f0838c277a84f9dcd85b1a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or disposable hosting, suggest a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the nature of the URLs and the overall detection profile indicate a high likelihood of malicious intent, possibly involving JavaScript execution within the PDF viewer to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=free+up+memory+on+my+phone PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/715d4d029546dc7c4855ad2169250244/77916847773.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/77654806869.pdfIn PDF document text
    • https://blv.by/upload/editor/files/fuforigitewanizinin.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138aabb2d59d---xinefisovi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161492b2082e79---dorume.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614636436c341---lujetazunu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614729729e930---86048480627.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/vilebutivul.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/27752080651.pdfIn PDF document text
    • https://upaspor.com/resimler/files/73948470009.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/fugofonuzuvuzuredarino.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/sulitusexunozite.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/xotumazikuduwoz.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peporiwodatabanoda.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/wujabugigirefexaxefisa.pdfIn PDF document text
    • http://isvpro.com/custom/files/medifigixedetapojado.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/69403137309.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/faxedazeko.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/7392825994.pdfIn PDF document text
    • http://herve-coiffure.ci/files/87636253382.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/vududodozajoxasara.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/53869480891.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/mokafukagifetanobomokexek.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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 10144 bytes
SHA-256: 8e941bd1e47fd2198e550808d53ab90b2174175d87b46c2821be0c50eb7d7899
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 18208 bytes
SHA-256: d4f68077c5370c59aca843f07b2460312bd670d00d90f3f8b4d0190ee05752f8
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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