Malicious PDF — malware analysis report

Static analysis result for SHA-256 104ae8036688c455…

MALICIOUS

PDF

79.9 KB Created: 2021-06-27 20:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f37238dfb4c52979ac1e3aa175e2746c SHA-1: 2aaf3234f15d32953201822dec406e5eb13e4ec6 SHA-256: 104ae8036688c455a6361687d271c7d2c3aa2affa3247a2bd3d225729821ac34
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's primary purpose is to trick the user into installing a fake browser extension or update. The numerous embedded URLs, many pointing to compromised WordPress sites, likely serve as download locations for malicious payloads or phishing pages. No scripts were extracted, but the overall pattern suggests a social engineering attack to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=color+replacement+tool+photoshop+cc+2020 PDF link annotation
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e832e0fa34---64981890281.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7232960e2bb6ae544f62ac2910dd8967/89955604552.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/moxoxepuvanozibovade.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/68830764043.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/iva2qkqldv9o9cqhutsgcaql3j/wakawamuxonijisukijut.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/14828465169.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a8f33102---86396730103.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/62f561af9bf1fa0abc44e372ab01bd4e/41686456332.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7830ca3a---vazakesekixejubaruti.pdfIn PDF document text
    • http://web68s.com/upload/files/diletatexu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b978fe01c90---19812863271.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/54352270489.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f161beb277---litizexo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s58q1fdov5amns1b0djunvjam9/norarobuxotafugowil.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/mobiradotoriguturovu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0a2fdfca02d5eacf41c12d4435eabcf0/73971537060.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/lemimapuxelewamegun.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210620_AB680560D429B5A8.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac2795058---titovog.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/51944740578.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/73969797166.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3d2241d7---59423663066.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/30604886460.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/3315544355.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16492 bytes
SHA-256: 0f458a5f958711e213e5e52dc2326ce183a130cf25ced9e6f1a957b2bf80602d
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10820 bytes
SHA-256: 9a2ef0b05830d04bcdffa18ebf91db6dc656077b5dae80c05a20be15bce0e8b9
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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