Malicious PDF — malware analysis report

Static analysis result for SHA-256 389943c5c05af993…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7411adf33b8afc6312025a515b1cb0ab SHA-1: 162b5f13df3a16495107352bdc080da8ff9f6696 SHA-256: 389943c5c05af993857387c3eb08cca1a6d8619272f57b666f2c8e12e202feb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the PDF structure and URL analysis are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=geometry+dash+hack+apk+ios PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4e85fe0f5b3f9e2dbcd99bd05ee06790/jisilojila.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/18626005134.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/91848973310.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/7500681602.pdfIn PDF document text
    • http://ipublicity.cz/data/file/55017130197.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/68052814232.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/99754433233.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_031628.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/kapej.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/tusevexedase.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/lekizipanakilonajipu.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/fenaxevizabub.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/kawavonowilux.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/vipodumivakemef.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35a40ac4b---43906219823.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ba4a44.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db42292b1f---97445116052.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/givem.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/72613925570.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/dadejuduxapamelit.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/55227664694.pdfIn PDF document text
    • https://datajournonepal.org/files/tekaxifixato.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/17472246533.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/69051068536.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/5613475182.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_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 18928 bytes
SHA-256: 1ff84596d1267f8d2fde263f2a68a4bc8a1209bcdb497bef285cb3fad682ff82
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 10872 bytes
SHA-256: 80a9936782d81d11badfc67841a7f434c4d4b1e28aa976733f52dc71c7d14f41
font_02_sfnt_off000131ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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