Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f015fae282f496…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 01:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06cbc4873405416d3011786a10b8ed2a SHA-1: 32d43815ca786f98a7346b57d91718d2552d233f SHA-256: e4f015fae282f496f96169aad51bd6b04295ce933373d07db4083e7fd67a989d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ooobelkom.ru/ckfinder/userfiles/files/wulariputufidemolora.pdf In PDF document text
    • https://isitekmuhendislik.com/userfiles/file/30284541534.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b297ac3087---43022436556.pdfIn PDF document text
    • http://newo.ru/files/files/24440572813.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/94603268391.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/rozubejud.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49dfbc5e6---8658529660.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/zokatifofopitotojeri.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/nowepivivunetabotokokak.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/99dd6d094d1a835cc333d446d2cb7a06/37437277446.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/fd5504f37abfb7c56b8765ba13723a91/denepibuxatofu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/or5g6gtbsi141mm41vrhdto5hh/ravilafibonumadijawa.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757916dd68d---54831754836.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/06815a3fbe51abf7979ed3f9fd0249d6/wupusopuzevifojixi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161255de864692---24128033503.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/a3opnjuptudkfsvk900sopteti/15183334019.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23453371730.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///mefidebokunuwomone.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/t7v81kdvlmndlq8f9rmgnl1r16/xuritojotetabusegolajizut.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/55852443330.pdfIn PDF document text
    • http://vaynhe.com/upload/files/60256791586.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/mulobumegikopereliferoso.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/65351570703.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/zikuxizibamatitosagumosiv.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/josogonolanelopoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=coronilla+de+proteccion+de+san+miguel+arcangel+pdfPDF 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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 11092 bytes
SHA-256: f12188cf3faab5f7801b591a78d5c89e9727c2e848113cf70efe89bb73f626aa
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 19612 bytes
SHA-256: 38157b0fe7bd05f76f21db24c7cf7be2e0e855d29ceee1dc9c8d88d728c6a4bd