Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d3394bb7066785…

MALICIOUS

PDF

92.6 KB Created: 2021-07-13 03:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 381cc8df5921d9d8301deed3b7b42320 SHA-1: 0369931c55736327393595b7dcc29f75a455d8b9 SHA-256: 49d3394bb706678534d8fb986719ff689193b632b5f1e68a950d25015032e1e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://coretry.ru/uplcv?utm_term=how+to+extract+all+images+from+pdf PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160821d02375fa---54134829155.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/66679d11c3827f1e6a32cf212db1b603.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/41952227849.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/92747856679.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/davijuseradako.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/28087111822.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/filajixifadavonokazaguw.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ff8bd2d91c9d7d15427fb5cdcb75c02a/22086154954.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/80316703249.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a1d266fa2---luguwopaporososemaxi.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/weguza.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kmhs71qtbtjr7tt5blsihf0kpg/xotakogolazilofalejo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f7521729ea540089493fdec48e0f35aa/poposenuzubuwogez.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/tagikuxapoxotifoberuj.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5vjvn5sfhol605k9d3olhikjf4/57991375241.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/dapukadamavigupuk.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/stf62i981q6p2qjq5t8mgnm4e5/jotajux.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/63934674785.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c931a0c8ce1---nimogovasodivi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mepor.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fea1e3bf---64963264293.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc299274b---ruzoniniju.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607774ed42fe0---sadenobaketoz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 17984 bytes
SHA-256: 722a436c5d1eb22b7ed67ba235728a50694ecdf6040e010ab3397e9a1ec40b69
font_01_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 16080 bytes
SHA-256: d9b8130aa6f9633ab3de79ff31e2004108ab7689d1c7a99745aef320e0a208db
font_02_sfnt_off0001311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14934 11036 bytes
SHA-256: 76b15c153695d25a435660d67b1b244f327df5772cdaa292949d9b4caac87b10

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