Malicious PDF — malware analysis report

Static analysis result for SHA-256 8136fdc9cfa11656…

MALICIOUS

PDF

73.2 KB Created: 2021-07-03 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 511ccabdc6b7e6b6e5957eb0b1aa11f2 SHA-1: 88901484056e187754a822ab2d93c3e427fd4bed SHA-256: 8136fdc9cfa11656f8aba0623df06cfd338c811ce41e74bc3715dc0a0b01f1f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by redirecting them to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aclamerica.com/customers/CMS-IMAGES/file/vunologadezizikajop.pdf In PDF document text
    • https://eletmodguru.hu/files/files/zununagi.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/461c7cea88ad39f9894a16b17851c7ab/daxewupikadixebopamerogo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda6a68c90---21546738679.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/58376646128.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7339561cda---ravokolofofumanigixose.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c42553303---52379116272.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/58399037226.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0ce7291a---84082543734.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9c243cf3f7ee826fbda051ca85dae59a/roxejafetobarami.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/47505729943.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/77342741366.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q99uqh7980b0fve7g2jeeld5hg/6275383116.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/22813266133.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/pisufefubuzoja.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/xeboduras.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b422d24498d.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48e0a0b317f7b59a73d1e6d8b791e1e0/89831937396.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155797a60f---23213636865.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/96940987968.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/749d6cebccd0ceff77d0936e7b5d2cab/gedakiwavuburanu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1218328abbc18cdafb33cc6186ab5631/52003172317.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef8968ddd---73323158546.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a5778414b---valesusenixugoruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=parkview+school+hoursPDF 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_off0000bd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 10472 bytes
SHA-256: 5505d654413e78956935c02a39454441354bb0941b4dd37213bb9ba97e566855
font_01_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 16248 bytes
SHA-256: bb289dc886869c5a95bf7b0bb2ad572e672ff5712b092c158b01443cca12de2e
font_02_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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