Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b968c0eb1c8a343…

MALICIOUS

PDF

81.3 KB Created: 2021-06-10 08:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1f633d78d8f5c8007353e4368111d66d SHA-1: 704e071bec4a0aca05f121647b1bb071a66dcd95 SHA-256: 3b968c0eb1c8a343fccd70f1ec213dd162e33bd4134b71e5e7f2784fd7557a19
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the embedded URLs and the nature of the heuristics point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=comprehension+passages+for+grade+12 PDF link annotation
    • https://hondamienbac.vn/userfiles/file/10158443657.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/vizuxexosenunokaxinafu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d15c51d63---46466484123.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9ijofnbdbmh6qchmue8gd16d8f/57194652426.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/katiziwiga.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/35462548916.pdfIn PDF document text
    • https://hagepoorter.be/files/files/nixugejokigojonojovuvuzus.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a564fa34ecd---sakibi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2e6ec820---wukozipe.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/17bc59dd9c0e7ee9bb75f4d625a16723/81490918997.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/946de2548c5787ac628e94de7eac6519/dazagik.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/bikotewowu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/sijegalesatopapuxi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i4vmaml6s87jvk2s0vatefe0r3/7428063671.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb929979bf6---pabojonefomajagudufesew.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ff724804ece19ae16751196a684f14e6/56085581441.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0av0rt01u3n67tnr2f49vicb6h/40806240045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 5340 bytes
SHA-256: 9da99e2a526725e3a877894fb13fecd16885a219029a6fd0b2a29e36dbe60be3
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 10740 bytes
SHA-256: 211815a9572f7903623bba01ace6fe3893074d96a55cfef5629f39cd25da9300
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e