Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8178a56c5511ec…

MALICIOUS

PDF

108.1 KB Created: 2021-09-02 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c9d6d9b4a3d21c6eb00762e1c30dd53 SHA-1: df7974e7ef411b5ee38150ca79537cf6740ddac1 SHA-256: 6d8178a56c5511ecc3071dc301d07b183a5b9c5c318abc28624f87e55022af71
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=canada+boat+license+answers PDF link annotation
    • http://mictrogiang.com/userfiles/files/tokofupaduxinenesaki.pdfIn PDF document text
    • http://isgsrl.it/images/file/gipafod.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/tufiludimexeb.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/tulagakitanu.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/98995837585.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611153aaea2c5---rasukefoxadi.pdfIn PDF document text
    • https://maturana.cl/upload/file/75545063400.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d0871f2308fbf1d530016f0cce133d4b/donawoviketiliputazira.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/8934036556.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bcd91e52ed6f008b75bff9157fce5750/85583649392.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31743b206---72681626288.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc54d90648---99587622259.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/vubotunuzadumavenew.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2kb12bad6p5l2qsvo5rca7so94/jidulemetarepinedixi.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/19777013993.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/doxegijesafori.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ba86e34c---togukaxotusazar.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/19827312079.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/85551745687.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/50lso8k19l9lh1h2qphir097gc/rofovigorokapopivenopoz.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/41560585557.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_off00014276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8D 10620 bytes
SHA-256: f78f49b9fdb408cfc893a48e733bc08c3cd7251839bdaceafa8416bdc224c067
font_02_sfnt_off00017307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17307 18140 bytes
SHA-256: 7740f07105f948e90ffe5a1592bbc92c0f3fbbfa9332d6bcf58f856b1a08b378

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