Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b5d6e703538022…

MALICIOUS

PDF

81.6 KB Created: 2021-07-20 08:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b83c8099d6c1b1977d2bc8d5fd7315a5 SHA-1: 77467eae2604ac51fce253f8b417c55353fdb958 SHA-256: 81b5d6e703538022e6f4b60a6c4b65b4595219424b359b1ebe3ca702db459b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea37333fb2---sujazawez.pdf In PDF document text
    • http://turinhotelcompany.com/userfiles/files/bowezuruwibebeximi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b9b9aeb65---wuxodutobo.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/liwubakomiveso.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/taxuxupa.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/28264034412.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/4222847846.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/rusorogeronodivemujuxugen.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/24623372753.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f90761b305b6f536b1918289dfd85e71/somagi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/861fc3c0da7999d54d63c7dfd5a66da5/7571661127.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/833a694a3c334052349a890329626293/zagetamimedotufagukanapi.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/sejuvigoneduzojon.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/nakekenawonaw.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/duwugobejowoxiketalolu.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/64efc9867d5f41bc0f9c780c88e5d067/53889519889.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/r9c0g2e6s8b3cvou0vks029hc0/26375473279.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/sogilalemetikowazedodaz.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/5078483409.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a356251fc7---fiweganemitiliteg.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5mdqd23qi6i8ablt88h9erg9v7/pinikosir.pdfIn PDF document text
    • http://rts-3.ru/upload/files/perisakejowuzivonexevobuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=11+inch+circle+template+printablePDF 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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 10444 bytes
SHA-256: d2f93743db5d748d3ae82f9939270be30ccabbadc84009225f355fd3ee772fd3
font_02_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 16348 bytes
SHA-256: 494b8e4fd957f9f67d7cf8128608f3a11e1da422664dfa585dc8fc453b47c313

Open this report in the interactive analyzer, or submit your own file for analysis.