Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bd0ef57cefce87…

MALICIOUS

PDF

105.6 KB Created: 2021-07-19 09:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a9b47857c91d841c74326c6248ae4333 SHA-1: 1315281b06cf7e4563588b9051112f6bfc0000d9 SHA-256: b0bd0ef57cefce87fa996bd9afc9f0eb11ef34ca7345f4f8214cc143889a600c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic firings suggest the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://atthaya.com/file_media/file_image/file/wajesumikurunujixal.pdf In PDF document text
    • http://bezpiecznamlodosc.org/files/file/pezexi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/o984beoa9tr5iuvom51r5f07h8/mogig.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/18294711031.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf20406391---ruwetavabewuzusuzuwusibu.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/weboka.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/selutejifulunezuje.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/jivubezefig.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/17213689681.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e909a7b85---ritofopilogajuvonifitumud.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3d802e6c75e9d8f16adbdd57f5bd99ef/meludowakixujonexapitafa.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/vilimuxelurejijugejenewux.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2512c8792f12014c4d427782a46c7f5b/36198795771.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c878a903268---3354930308.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dbf84d3347ded1d49f394ca0cf5b789/teketefi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d336ce6a208---voguxinu.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zalalezetefivutogurupaweb.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/98a6ada6e310ca6dd8ed685d7954b9df/91992332104.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2rlh6vsc8k6fdu4nan2ho8f7a0/7632422625.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vusivotilosuwifud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=layout+meaning+in+marathiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017a14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17A14 18800 bytes
SHA-256: a1ac7a58bfbedae8952c8421645409a8fec687e9d6b6f2822e40c1bbbb71422a
font_00_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 18320 bytes
SHA-256: 10b5575401c932d12377cb149d25ddf0a665a8df82f0c88e073895abd9a84f70
font_02_sfnt_off0001625f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625F 10512 bytes
SHA-256: 9ada2ec02414ea435d1331042de002a1af06afabd985004a3a7c2b3279f85821

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