Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0585fc9b5bf3880…

MALICIOUS

PDF

104.9 KB Created: 2021-09-02 12:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cac849d63c6402985ad7bb1602208e59 SHA-1: 294d7070013ba4e2c587be3747b783c15fd96192 SHA-256: b0585fc9b5bf38807721d7dc5baf343ea1fd857e0eb044f48e5a10f172d261de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic to disguise the true purpose of the links, likely leading to further malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://irlanc.ru/uplcv?utm_term=cmos+4000+datasheet+pdf PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ef24fe922d1f292b17831f13d60c6006/zotuvegasariwudodub.pdfIn PDF document text
    • https://raljob.com/userfiles/file/56742362367.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/sifajubefitavukokadetijo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/86093bf12b4bcc862d6465d3143d3dfd/xizuxojavubejam.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa37544db---moselepowidinilubud.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/30249007566.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16129b9f356d25---zizanefofonarutagokusim.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/63935698045.pdfIn PDF document text
    • http://getdol.com/page_data/file/jebakunimemute.pdfIn PDF document text
    • http://premium-h.info/files/files/wagadojowed.pdfIn PDF document text
    • https://alutat.com/data/file/tatolilizababafum.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42568a42f6---delokutefewakaxoji.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/77235326529.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8520e2703---22949501028.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8a2c524d---95683939458.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/gawarileze.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/gaberoreto.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062011540097.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608172a3eaaa3---9826720677.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf42e2fb5c---xoveren.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7ba09488---70666865723.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_off00013494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13494 18656 bytes
SHA-256: f7b3dd6a9b0c825751079ef81c8c24d75a83228f9b9676c6e3e11240aa37b576
font_01_sfnt_off0001655c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D73 10652 bytes
SHA-256: 997f4929f7c709926b941b0d1f0f29d0534b6ef56a5dc5f053ea875fb368fc2a

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