Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b5d7846b183350…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 10:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cb1c7252eed2b8385c70dabbe550ea5 SHA-1: 3ade9572cc86139a20e19f72f0e7a547bef61547 SHA-256: 88b5d7846b1833509d8e16b934bc329cc21b302f0ca198ff8ed561886950c4e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=love+everlasting+full+movie+watch+online PDF link annotation
    • http://linyuepharm.com/upload/files/xusumobidazimazot.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/buremizupaxenigibobavidup.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/zuzepazujumor.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161424a60a6bc4---93730560525.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/66236612189.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/79096219201.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/40444264607.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/35248764845.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/006cc346b8b46f8f94ac3f88f264865e/lazawaxukural.pdfIn PDF document text
    • http://davcpundri.com/css/file/tuxasefemuvoxise.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/samiw.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/58838291950.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/joluxeriputorenuzij.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/50294020266.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/57232753994.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ece29c6f86846fa59ab78335bce9ae61/50265010637.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/xurowegoxuwukujopaxi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/dobuzav.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/2906038892.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/bifezivid.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/sivoremezesegolaluvofufaw.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/49762165576.pdfIn PDF document text
    • https://foulardfotografando.it/file/zevuxomalegoxidipuse.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/xunopufepiv.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_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 17516 bytes
SHA-256: 999877465a1e3a95e1cd63ba84cba5b84234f9ccd278cbad9f7613b0919c8961
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 10992 bytes
SHA-256: 0bb54b94819c3dbd326cbfd5a128b151e22c75c624949b18df5450eb03a11852

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