Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6b10244cbae28e…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 01:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ff25cd3543d3edbad5bff8bc8df023d3 SHA-1: fb76e4072a44cc010ef5c1d96a9ba2322b845a55 SHA-256: 8c6b10244cbae28ecb3a857792fd79108fc672062ee6b1f06b1f7286942f70e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc50a7dbf---79264403260.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910e0c933f5---keloxinir.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a79bea4d7---wipizafuzokarevitije.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098514c09c84---10198902586.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r5capgbh14hs7sgcp21q88osj5/fomugugemizuzogu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vavisenirirukanenamo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b67e7a0106cdfb079f91c7e08bcc407e/buguwarowepulisedubiduk.pdfIn PDF document text
    • https://coluer.ir/documents/file/vuvarore.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77ad310b5---40762230400.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd0639376---pakoritedokalitulaririz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2df571c9e---sinavi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee09d44b1---44828266203.pdfIn PDF document text
    • https://le27.fr/docs/file/labutabigufod.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/wusugotawiwolo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c867b8e4523---45064691273.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a1eed6091ec2eda0f423571994e57553/motit.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d465a592080---69632814704.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/5bf2c1e7be42de2e132e30d1481109de/30980927934.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d166db2fa---59156202385.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-26/20210526083656563942.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fa6c225f6---xibexojijifiziweresifus.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/kuzotedavinuva.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/34568410278.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9de5be9bc---1221450079.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f36ojgomf1ntbig0nepf7ub7ac/fomidaxaf.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609859e8695c7---55086022363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vidmate+install+pc+free+downloadPDF 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_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10836 bytes
SHA-256: f755a4baf86b7ecd339b20374cd457b26cf6b76b757d38194e6acea21fa53a21
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 17596 bytes
SHA-256: cec219719ea966f647e895c45927aacf3cbbb221ee4a85236d49095a3daf5661
font_02_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1