Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b2213dfdab0f8f…

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 05:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c98dd65361a1f30ab5df55aaa46ed60 SHA-1: 7e712dfda280b51433d1d52338f72328fed49c4f SHA-256: 53b2213dfdab0f8f9f6274e5a645edd0b38f8f2574666b22b17bbdf15241aab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de38f21ea---50786238470.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160759b8c26ddc---98207252437.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab430b13e31---wuxuzirimaxaruvu.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/17562639034.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bac92ebb---jabiped.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/41363065680.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ada3ab965---gewewalevofozorikalol.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/zakivuwaranuvit.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/28024789215.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/mavidulekawanita.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jutowibiwa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/h3c2up8i1tj2j3c9ppfid1m5t1/teromaserata.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/31637550709.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6240171dcb---6068800054.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/506643a3666bcb413f65dd033bc965de/demasaz.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/03f61b58369c6fb617a23da410207715/xilifofeturafi.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/ledutezozidirolaganapuxi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/gewunovefujepasasadorefoj.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7bde697c932b4814895cc8ed4de78969/torufodifaxopubi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210707_5E9180121262548C.pdfIn PDF document text
    • http://nensi.si/upload/file/ruxifozonexeburadimowek.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4f31eea0e176a42eb51e2fdfe890c924/4888710638.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdee3d869---56029407065.pdfIn PDF document text
    • https://langumeistras.lt/i/File/sowafuxixevazu.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/47573921403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=parallel+major+scalePDF 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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 17448 bytes
SHA-256: f6584b39682803c3bc8716b25e6eb2beb3a2b856e7072752e26cb068edde98cd
font_01_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10228 bytes
SHA-256: 025ab448557db07ea9c1865f5a15665b339b0ce565d0c872edd4b2a99d9a0d77
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1