Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c4bc782032f09c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 07:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3139d32cf5907c8c91517e55d433997f SHA-1: 951f255943a559967762774e8eae40e62e78e15e SHA-256: b7c4bc782032f09cec6bf2944d99658c818b9b2d7f8782fcf3f931bcb5201931
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 WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://modellszerviz.hu/userfiles/file/80676276031.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134bec4e3479---sopaxumev.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zepiduxumopubi.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/wedusizizijel.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a190a7ac89---migib.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/zokowiduxeleku.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/nanabekekujix.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1bb4105a55cc488d925e649d36b51587/nukorokirabusot.pdfIn PDF document text
    • https://wmu24.ru/media/file/zojinusiribewuwofa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fddd0f050e37f733775006bba25f2975/45166848036.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/nokosivixaxofi.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/vebar.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e76c2dbad---46728054150.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/66005125242.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908122534.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161310f14182d3---lamakipipakuzerolon.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fomekevapanimuvumunibid.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/zikunixegujozelibokegaz.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/nuwisigasaj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cd3f6c8d758d0d1802c0c0bbac3e30e/70571374782.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/41667914011.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/mawugagegem.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/74942524344.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///70963803281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mobile+legends+download+taptapPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 20364 bytes
SHA-256: 9b7a6c64cc42b7ee977e7ee2af45b19338e65c051a08dbb381286dd8933eddcd
font_02_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDA 10688 bytes
SHA-256: 47c08a78e31b72beb16c2e8ea1e6718ac3a5c9f4ba9ec3f3c4d2b848fca0ac3e

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