Malicious PDF — malware analysis report

Static analysis result for SHA-256 e580160b6ed219cc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 17:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23c9858c0b03ee7bc3348bac24d64a22 SHA-1: c2754f41f3ef3b4fa9329a3fd00ce274a190f16d SHA-256: e580160b6ed219cc983e16181b56542afbb86aefab9cb7e6bbf9e2d7d45842a6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://thegioimercedes.com/upload/files/951145342.pdf In PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/82976800516.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/38198756000.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9fpfnavel1v3efuf5m9mgc12vk/86503736874.pdfIn PDF document text
    • http://cmtsport.com/pliki/najizegoman.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/86012903930.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/kugosegabolenuxibipuzozu.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/nepin.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/rekiguwogokil.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161515ef6ae7d8---bofibajamiviviraku.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/limuriguwi.pdfIn PDF document text
    • http://schokofontaenen.de/idata/30253448598.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/kawekager.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/mowomoxujikovasakikezirav.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/tasatiraje.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146872d68203---kugaxufen.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/watilukekajopi.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/betunimovewisafof.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/vawin.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gosuzer.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/kotuxol.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/jafirusikibugixevigejakuj.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-17/20210917190510190607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+app+for+remote+control+androidPDF 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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 16916 bytes
SHA-256: a536d442a4f002dbd196167213d3b2a8e34eeffa8476735453ca11528e3f2b88
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10832 bytes
SHA-256: dc4a9a195d2e20117705f8c403c43ddb27174506114dfca2322947604e09b36e