Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bd81dd3849cf95…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 06:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9b369341315d39923db3edb8eb80b80 SHA-1: 0e4f34b7d105c7dc9f7bed38d61262c8d2b22be7 SHA-256: 05bd81dd3849cf951bfffa8158ad4d41bbed4e31aed88fb601396f7b6d9d869e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://rickgrisolia.com/userfiles/files/28163772827.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/97b13670dd54c6a32c7774adab0e7c66/rozetikafavetubo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d9811e1191---pujezofopegodumigoxoz.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210815071156879994.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/47ffdc00a18053316aa6c3b609fd3262/92170727584.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/43837651248.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/26838282863.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/52164300763.pdfIn PDF document text
    • https://12shio2.com/contents//files/76446772358.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/ludov.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb86f1c93---rureturerawi.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pijivusabarifoburarimaf.pdfIn PDF document text
    • https://majubesar.com/contents//files/vuxegatowokukurer.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/lisap.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8mdjkrfhcpiads3tthpo1d27b6/vowegu.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/wawinegezorifubajujagow.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5284ec22---mujaromafokoledel.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r800plchplediqevt1tdrh6icd/zesizowexiwevogubovaroto.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/75235848894.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f91a07177e7a9a3f7352f3820711a2dc/sevemumabe.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/jogad.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/91801793381.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/45850884661.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e6uliv9lbbv3psafk4bbio53kb/sukuwovexefinavefirine.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/48957089310.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/zizoleximobune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=alchemy+expert+trainer+wow+classicPDF 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_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 10920 bytes
SHA-256: b8ea90782012e5533ab7ad918cd091556f8fec210034ed12c52fbecfd9002f2e
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 16628 bytes
SHA-256: 3e42c9cd2b49aa485a917ad6df05f645177d7b07689c76aa23ccd74864c126f5
font_02_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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