Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea5a3bc2c1694e5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 23:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b05717e2707520b3877e929944f25628 SHA-1: 794f00b705ed4341d84d5aa4da98c748d38aa4c8 SHA-256: 9ea5a3bc2c1694e5a466ddba979cc6b09d7f19c5d0f4c54754b36c2eca62b1f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=play+store+download+pending+2019 PDF link annotation
    • https://sangolongphuong.vn/longphuong/news/files/japanerawoga.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jemigir.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/96821886177.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d685ee25---gabojaj.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/abc66542af07f1159f0112a2501189eb/forojaseloze.pdfIn PDF document text
    • http://soupworld.de/upload/file/gifafajikaze.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9cdfe37f2bbe4471d7c8f9d921a37b4a/genalivam.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/varebitaduvizapija.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090603290073499.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210916021715.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/13018254079.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/pezisudazugizig.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/79602274259.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lepiruzuvajepetogosusax.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ntc7irbamck0h36c8ifl5u5oue/5960380101.pdfIn PDF document text
    • https://conrays.ru/f/data/loladejo.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/94830595957.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed62b2fa78---62612531311.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/jibemusasesigofiguneburi.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/roxepejinifolovoba.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/63711700525.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/93715967149.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/63619007062.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42823143522.pdfIn 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://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_off0000d0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 11228 bytes
SHA-256: 0a1e68ad6199b0517fbefa8d790880e6fa95b15ead183c36779dd72e612beb6c
font_02_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 17220 bytes
SHA-256: 239f78df4e0451a416456501eed1f08f6f3477488eef483bd4bf0d75e7c70a1b

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