Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b7a82ffaa53def…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 22:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9ee8412326d44df35471b754a2c333ff SHA-1: bbc3d7dde320f67f3c9c890a2ee636658a410b90 SHA-256: 30b7a82ffaa53defa7a35cd8eccf1bc796034db1079270bdaa20692657d027de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://nirmalujjwal.com/public/ckfinder/userfiles/files/xibojewaduzipozojibe.pdf In PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/rutibezef.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/iqdpvn9gfrgeheu4ah53ifhb22/rebob.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cksjqmaonniat2scbolbfveim5/romegoxotesu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084857ed7254---vinitanegox.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uk6e0fgta1m8s3r73c3rddr40g/24534659114.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3e900b5cef---kenevulusimiluvigaz.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/lujoserolakatodovapu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12874c0b1---gimuteguvif.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2464a093---32588171481.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfebd2456---kupedegadesazuravogir.pdfIn PDF document text
    • https://belloverde.net/emailer/file/fosovupomufev.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/mamixenukidagusamot.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e3b89265---19759705126.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/48411405449.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/ributu.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/wukiwelugonabirevazo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/35460165165.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f3be416b---81228875661.pdfIn PDF document text
    • https://egca.fr/userfiles/file/78582841019.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/76b2c1cfe962fa4e36df46dab677e8c5/jabekolevajix.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0ce33bc508d800e0f395d8140984cdf4/29383930445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+scripture+says+vengeance+is+minePDF 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_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 10928 bytes
SHA-256: 8a2a7683f6a7daa4b3ca5db8520d70cb9a824bd6f424d45a5b04eaf893bd89af
font_02_sfnt_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 16780 bytes
SHA-256: 2a3b90a42bc556541392d216ce178cdddafb29fc4bf36f9a76c87fe57e181567