Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb2a431e05df3da…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 20:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1897d7d758238dd7b68057e842d68bd8 SHA-1: d4a571fc355072db8ef7be87bbdf1894a993e105 SHA-256: ccb2a431e05df3dab83de65fa4cbebf71183c9c521a7e25cf55e4f94e529e5a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to lure users to malicious sites. Heuristics and ML classification strongly suggest malicious intent, with ClamAV specifically identifying it as a phishing trojan. The file's structure and URL patterns align with phishing campaigns that use documents as bait.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4418d9742f11f77557b39f079b09f925/vujug.pdf In PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/nujolagutevoxaj.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/guwiwowixegonitovuxugezoj.pdfIn PDF document text
    • https://makenie.com/upload/files/xafokidadekowi.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/59135854929.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/jefovuvebiwarip.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43022266344.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/serukupanibazo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39f4858af---sizeranagapixakufubagel.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dee805b1139---6982568039.pdfIn PDF document text
    • http://ubest.ru/images/file/xofejisovedakafuwomi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc8aadda67---gugagofefufunopizewoviwe.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c5a98c048b529d252e22a5acb3b9cfe6/39357066457.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/90080856301.pdfIn PDF document text
    • https://arerp.kr/data/file///kosowupixabepajuz.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/rowamekapuzi.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/sulotubedurokeritosifazit.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/54481056818.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/limoravewudarovute.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/sapawetodi.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zewagejodorizafakoma.pdfIn PDF document text
    • https://stormester.no/files/file/pufamevep.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/16556985720.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/96839993889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=purloined+letter+critical+analysis+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_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 10828 bytes
SHA-256: 5f4a38b0c2c84b44b04f96067d61b7875602b97ee23e6c0e0e95adf7e34da08f
font_01_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 17268 bytes
SHA-256: b68df63985bad02a8ae9ab7612942636370864c74accafb8144376f5584fdff3