Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f1f68950305999…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 22:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99e4dea7e39518b5a872e80eaeaf559a SHA-1: 4a5ebf9a9372b6718d4a7ea7bd2bbcdd3adaf1ae SHA-256: 86f1f68950305999bf7bb2b8f3227220508e38b7fa12c657b8612a44a5f83026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate that the document is designed to direct users to a variety of potentially compromised or malicious websites. The presence of external URIs and link farms suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=translate+pdf+online+indonesia+to+english PDF link annotation
    • http://eiak.org/upload/editor/files/puwowalozuke.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ebe19fa06fa77838de64392f1c4a33d2/55171973007.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/72803184574.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/60777050609.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/75278052717.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/luton.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78d332f42b17397e82591a215f994879/nowekizusawawako.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dae4941d5---konoxikixuzum.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ikr347q5fs50hod8agh0t4c9r3/xujinuzitemok.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c431d501b1dd5ba5ea251957c77e30b6/99884778818.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160794075ca99f---38251660282.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/xaxuriwejezodop.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6ef956cc8---jibof.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/36426283765.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/51726897845.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/giwetedaxibunubupabugexe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33a5815ae0---sedofukolakupexu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9491479ed8---novalamumiru.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160953f944d96c---jubogipojumat.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/zonutaxetibim.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210721_214118.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/zizezebe.pdfIn PDF document text
    • https://noventa.cz/media/files/file/gikovaxamenexu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/691dcd3d33eab5d2ef3f1271176e4ed6/12967818907.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/vinivolodapumawadifiboza.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10740 bytes
SHA-256: ac1671f26bba63ea113ade4b728e67b5a0602a2f6b60f145beb0f128c4c3258c
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 16580 bytes
SHA-256: 520736596aab06278433d995e903795729015675bff356b07700316392733975

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