Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fc4b02a947fd18…

MALICIOUS

PDF

91.8 KB Created: 2021-09-17 23:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 080eedb8e117bbcc19e090697013988a SHA-1: 54af15e1d180e33f4f59cae49925d23b229f8576 SHA-256: d1fc4b02a947fd1821c4e9a102525f3b8139650cdfd4ae7b7ada4c3bc3b9eac6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a link farm pointing to various PDF files hosted on potentially compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://dunajecbiala.pl/upload/File/60929215500.pdf In PDF document text
    • http://taxicityplus.ru/userfiles/file/81071313967.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210916_2FF4CD7EAA91B411.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/11806337732.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/dosusijetok.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/49718361168.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/satovofamedemipivotaw.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/53832426115.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368757989d7---nogizubibimufebetomib.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/gokujowofemako.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/tipanaxiwolegalivafal.pdfIn PDF document text
    • https://razredna-nastava.net/files/40585711164.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/24198243142.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/tegajubezep.pdfIn PDF document text
    • http://lagrupacio.cat/file/65230044873.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/visumuzigasepezisetevoxu.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/42200499965.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/vitovuzinokase.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/bexaja.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/99081179882.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4ngj76ks5641aclbfkgfma1ii2/78080225162.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/tejafikib.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/pipedubajawuzodizuminuges.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9c92af24---pogizozifek.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d73ad046e---8879314415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=xiaomi+mi+10+qr+scannerPDF 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_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 10572 bytes
SHA-256: d6aa99f0cf3e605a8a5dc324865b07d5b2b6bf784e93c23bd91ac29d5fb6a6ed
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 19420 bytes
SHA-256: ead7fb0feea5a95edc217ebb8705d47c6b16f0bada17a9c53f98944884457fd4

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