Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63faffa7fbf159e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 01:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8da3a1449da9829a1c619400641f3aaa SHA-1: 23ff59532ae6af87997fbfdd48e7fc816bf85827 SHA-256: d63faffa7fbf159e87a701fa86b3b1c57c523d1787e55215d83b4af25633e223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that redirect to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of multiple compromised CMS upload links and disposable hosting further supports the malicious nature of the document, aiming to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=live+wallpaper+love+couple PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/627304eeb23f4e08d46c108298572693/gumibivofubixif.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/61462106440.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d7463dc---kuruxof.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68818026825.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kifapavamivodisifofagubu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/95965762194.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/85787776825.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0af3972c---kosavakekefopime.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/vidakezugufiv.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/jovigorimunemepalakukezes.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/bopuleloroxesezun.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/setunupekeku.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/73162883561.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/44407766768.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/wamepuxo.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/35141048982.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/jabewozigozogazeku.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613457e5ecb67---84051346049.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/17394642013.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/zonewimabujogoxuzewem.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/xasogusatoxe.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/75146253119.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/98584316978.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fexaromatator.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_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 16284 bytes
SHA-256: 33fdbc2f6120f7e2073de5090587c8a968f696d2823ca8f188b49286704f1148
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10208 bytes
SHA-256: a19d8a251d80bd4123ec9acf4d6e2eeac5fd465d8c22df563970041f98fee21d