Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f932e4fd5c78518…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 17:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61843c3019f04d166b08990fd48c0819 SHA-1: 81117c645db8dd1e93a0ff2b2be1319c369f5943 SHA-256: 3f932e4fd5c78518adc8cfc7f86df22c9f4b1d8e8a7ddf9387466cc187c4128e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload storage, suggesting it is used to distribute further malicious content or phish for credentials. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb01b6212---woboso.pdf In PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210624125453.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f712b581e7d5289c823bab67b3c95c0c/92916442264.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaaa1ddb60---684613188.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1d06060f92ea22ad6b4b73c14fcc88d4/ravupujaburefofevutex.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/28708605961.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100f0c43ab14---gigap.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/71397879186.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/resobiva.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/39682552782.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5e574729---rakuwew.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c3753428---93531538648.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/bidipuxav.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/96665566808.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210811_074621.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/36206206732.pdfIn PDF document text
    • http://geoman.cz/data/file/wixumuvotonozufifor.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/86109598527.pdfIn PDF document text
    • http://yuli-china.ru/d/files/refevikop.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161290459207da---manufofemi.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/52002635271.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/72770799487.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/76077309755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=10th+class+science+ncert+book+pdf+downloadPDF link annotation
    • 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_off0000b40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 11112 bytes
SHA-256: ec6005b8323754baa89c067940d23b02f0dd8e14743e4eb4e877f93d00f1b059
font_01_sfnt_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 15244 bytes
SHA-256: 007741808a7efd24d1ac5271c488d284d036629fc81364fdb594693fc43f8bd8

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