Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cfbd5f816ccda4…

MALICIOUS

PDF

103.4 KB Created: 2021-06-29 15:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0c4ec3b2c4ea90cd2eb44e0c2385b6fd SHA-1: 8e76a59df86ca4619846bd84cabbb8bc4198367e SHA-256: 77cfbd5f816ccda4e889ca58e69da44fb8acba63de693efe05e89bf2e930ee04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked PDFs. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://fygl.net/uploads/file/251950265396.pdf In PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/9989508070.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/43361079754.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5f2c1e3e---43511465915.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb55d40d2---60637718501.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/trnbu8i5ev9m1bhntp1bap6k0m/mapipiwofulugavorimo.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/93404680593.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/14445824023.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c273998213---koxus.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ina18rbop7j4md4m3er6ls8nu7/13003220050.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/duvenagulurug.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63499af38c---36363097862.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8cc58b03---tabaf.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160798804a1618---6585585580.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85fe0ee16---vefasosemavuv.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/79536878315.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/84123410311.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/81316455777.pdfIn PDF document text
    • http://yilip.net/userData/board/file/28734372070.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/49679896031.pdfIn PDF document text
    • https://waroproject.com/file/35543289873.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kasirajekunobipefitese.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210610_285865F5002B13D2.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+deep+things+of+god+pdfPDF 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_off0001340f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340F 10432 bytes
SHA-256: ec0043ca38935727c27036322e94737c4e4d237ec0dd2e00a29a91eadebeb6a0
font_01_sfnt_off00014b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B67 16736 bytes
SHA-256: e5508d338f8f7cd809ea05321db71c7f8726b596aa1d65b9c9902bd3641279dc
font_02_sfnt_off000176b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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