Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71eee0510f101de…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 00:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f312239f913c7d2439e563712a38504e SHA-1: 194fde132ef0bc6351feb307db1d844a383b0a53 SHA-256: d71eee0510f101de6a59c823fd9b5a48f54e3fe660042aeae6bc1c9a322800d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. Heuristics indicate these links are designed to obscure the true destination and leverage disposable hosting, consistent with phishing or malware distribution tactics. Although no scripts were directly extracted, the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://synerhu.ru/uplcv?utm_term=words+with+oo+sound+spelled+u PDF link annotation
    • http://ttccid.com/userfiles/file/pasiki.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zavubakenev.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/eaedc7646c36ab189c8ecd1a8a042f72/vetojuvuwurovazamesimig.pdfIn PDF document text
    • http://dgjst.com/upfile/file/vukixer.pdfIn PDF document text
    • http://azizolace.cz/images/file/7779546638.pdfIn PDF document text
    • https://italvaping.com/file/fotojidisiwur.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/39117366023.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609304680d561---35475290883.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/fenukojeg.pdfIn PDF document text
    • https://alutat.com/data/file/zidimiburakobubetokosag.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0de91791---foxusino.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0dd5m7odkuihivr8ovmqhfouh1/basisivuworizitukekilesot.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/38527689744.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161122eb2c1947---saxosoduwunasodakob.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/bimolige.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8969766e6290957c1572e39e52739938/popepizi.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/pefifugodefopodoz.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160981802911a6---90442556093.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/93481018561.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/96710455528.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/27780467399.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/naxofejinumilawovaz.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/gazafe.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/vofimijojuzololovagafebew.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/miwow.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/77546638912.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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 18784 bytes
SHA-256: 817fe9535502eb051c1bc2e0d5349afbea8f0bceb8b1ce76485c72568ed1be23
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 10508 bytes
SHA-256: f8cf48dbe1ac2453a3f8f08e4599e36a9059b6daa64b7a4c862fd2271e005d61
font_02_sfnt_off000126a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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