Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f54933cc0a528c4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-27 05:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b045b715996653b66afa66a0b5d56cf1 SHA-1: a6a913d410cb8c77abfece0cb441795ba9efaf5e SHA-256: 5f54933cc0a528c4b611f9ff5d1bb416fea2ce26d75f0200d7c41df143535183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, and uses 'utm_term' parameters suggesting SEO manipulation for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or phish users under the guise of software cracks.

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://inwebjor.ru/uplcv?utm_term=autocad+full+crack+2014 PDF link annotation
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/xopalidixapi.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/lirenosazelur.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/69077885068.pdfIn PDF document text
    • https://partnermind.cz/images/files/wirafalasuvepajepimelakov.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/55992242916.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/30148717862.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dubalokosinoxurewib.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba4692955---sejikidas.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/31275269069.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/17900021457.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/24180068108.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/dakomurimulexibumono.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091010161750.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/darujojakaditoxuweg.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/91995386689.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07c92530a---zarimuzo.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/wananaxomaxapogupoganu.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/lenuteb.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/vovulusometiwubefesususep.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/ninovowewam.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/42452486550.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/85826201857.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/wofuk.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161370e3dcf2e7---78500528083.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/xasevisizogidufaw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16668 bytes
SHA-256: 4db0fc04123393453f1fcb78776e35af0e647c93bb3d7054691772c0265469fc
font_01_sfnt_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 22780 bytes
SHA-256: 239de416f95520b8c0e01377dd99a79d107c9744b9c0a15bb5ec259a448f3936
font_02_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 10516 bytes
SHA-256: efd87424f54d51666e6b6d84aebebf8921f6fd796e0855d1a5b1d98eb1976880
font_03_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 2112 bytes
SHA-256: 7dc73a68ac43e45f097e5af407c7d00e5a99a634c813ba0de826d1e9fe535ec5