Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c67776b182d001…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 15:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b261fa6642dcb6eef8b1d763924ac74 SHA-1: 5ee2b0161eb5862719513669d05561fd168fe930 SHA-256: 08c67776b182d001b5df26217d2ecfb8e581f71f1eeb22610fcadfc3563d77d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and potentially disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/61a46gti3kftd31q8nkaq2tc36/76078411196.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/574lij0qsie0gcthrk1i08ahkh/89634212168.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/74843737153.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/58282614291.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e06e243ce---87076070055.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/17475975800.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/40567291775.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jinefamowijazegadetenuz.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/99551996321.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615394fb1189e---1253533086.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/27468310593.pdfIn PDF document text
    • https://mimpidia.com/contents/files/gisosarevonoredumesutuzof.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/jofepivapam.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/68012988125.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/53680886477.pdfIn PDF document text
    • http://rhondachem.com/d/files/gulovafijaxotam.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/daa467992d9de736f7cebaabdc4fee93/wivada.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613382ab74917---juxadegalepuloridedegabe.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/25738401952.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/1564050546.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/zivudujipikukokisedeteg.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/12625629542.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/futimudot.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/74506703548.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/40349793018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=light+headed+dizzy+and+tiredPDF 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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 10324 bytes
SHA-256: 6273ac7dedf6eea4b39e60c75e710e59e3d519eb0460c226d04244de14e22b52
font_01_sfnt_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 15180 bytes
SHA-256: c657f9931dcfc1892227b224846355e80ddbd888372953a9276f71b6f138f8db
font_02_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1