Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d087539b6877d6f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 06:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f66502e5b86c2f86976909e8381bcbe5 SHA-1: ab7ffa6e8e9e940767b6a4d3033d865e47a6c17a SHA-256: 8d087539b6877d6fe37c2da5b90450b4dc62e556ea1cd1cf241edab943e1b4c3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of a QR code lure further supports the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8b4cc20b---55555998370.pdf In PDF document text
    • http://lnv-cnc.com/userfiles/file/62214000951.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/degefopebiguropuvigus.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/lujijekegijusa.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r61tk8i7ggok75n8kp5ap5d03l/1566982173.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/sogidaf.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pelajaxativosutal.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1e383db0b3e0f093507b2cdabcf55c0f/38811043381.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/58094444721.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/pituximisasijokekobesopuk.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/jexamenilodovinuxovan.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f895c273db---57556955156.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0349f33fc---sisakaruvowijafigigojoreg.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bebikirose.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/kekidekaxorasapipufuture.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/janupedalomidubotura.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/85994389400.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/11870586180.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/semuvofagiwisenebabux.pdfIn PDF document text
    • https://samudra99.com/contents/files/76815349872.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/18244419eb8e01d98eb7128edd725b47/zitamatizafimaloja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=organization+qr+code+setupPDF 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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 10976 bytes
SHA-256: c633f36c882fd2b334cfc8a50c8dc04cb099fb570e20f7850fea336bf28fce7e
font_01_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 18232 bytes
SHA-256: dc806f5979871b71703a1801cd91e52f295e9f5be91f0d9f9b86340990b3da76
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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