Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cd070b794337de…

MALICIOUS

PDF

86.4 KB Created: 2021-08-01 06:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fa584020673175127c4b059beeea98e SHA-1: b51f21636649f2d1ef00d591bf706dd0c2d4c5f4 SHA-256: 82cd070b794337dec173201a5c05ef549e8da0b52603d382011ee0d21d3b8b11
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories, indicate a link farm designed to redirect users to potentially malicious content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b9bbe18b---14675941188.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608658b836571---76979637379.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/76717437035.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zidebugepeworotonepo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16104966f2577a---midalopipexixubogugev.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9be6152baa91ae9b5ad1b013b404cfb1/90898612782.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pugawabolevabafagigav.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/21033182206.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1f61691ab---kasabatatuwaduxe.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9vvvl8gpl7gu1hk3coa106vl1r/lugurasebubunudubi.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/68412615949.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/gasevokixabuwivetuzakipas.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/52105155767.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zekowigodomowuvagoxi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/eff5efae6e99159a853be0417e58666b/94898352271.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/88823209890.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/48445858584.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/sanabefopurajuzus.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fererivezomu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/83461385570.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a48bb417c98---mesukejore.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/d06cc1f2c4e04539e9f9c7d6c871a388/75749309344.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/86820765350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tabla+de+dias+de+vacaciones+por+a%C3%B1o+en+mexicoPDF 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_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 11052 bytes
SHA-256: 25ade7d63221a591630f84aed2d5953b5eaa87a1421e9e120ee7f327c7a29ba1
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 18056 bytes
SHA-256: abb24edcbc4131e59c58be1349b14b61523a67ef3ef0af2aa73b02f04e585bb2
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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