Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c433e233d8e097…

MALICIOUS

PDF

108.5 KB Created: 2021-06-20 18:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78e08db5778761711d24ebfcca63cdc1 SHA-1: 5d8102c544d25f4f35ff09ef8d39fb89c86f5a82 SHA-256: 39c433e233d8e097484d59b8f15a9d56c09ab34a533096b4aaade059c4e545bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, indicated by its structure as a link farm pointing to various websites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=the+minimalist+program+chomsky+pdf PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eff239fc---bivuxom.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/029a653e3a1ed08a02b3ecc3aab50d47/dafojoxuxususo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/p1r8iidmn7baptf5ume16svvvs/35441977352.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6e60f09d171dc6f2bbf020f47c6767ec/moledevugobemavemasare.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6e744007---31852260360.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e196592ca---sarivufarajebowe.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8aa541754---pazigafasugubama.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6bbacd04a5ee30bc71a9b62193690d41/fobikujered.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608748c3e2f77---85692071463.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/67223591902.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/47246854533.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ec143024c200d186843261fe0a6b2352/84271029967.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad4c9cde0---jowut.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/bc1f7b93309c1345ff411da6f9b561e8/7458837009.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/gijiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E4 5684 bytes
SHA-256: 9edde1dfd32a24eacc5f9fef0166fb78e764d6240bd3a940fc024dd1b85efde8
font_01_sfnt_off00017715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17715 14420 bytes
SHA-256: 556bf325f97027c94909272d0d7456f9e45e130d3f10dda03a16de49ef7c1759