Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b797fd818fad51…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 10:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e363cfdf7f7d19f44c558852d2df9da6 SHA-1: 88c133d48da187e9fec9f08742969a0c5657423f SHA-256: 73b797fd818fad5128a95dec3fec0c727c158daa4be321c9c58c7c028f17ce4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised websites, many of which host further PDF files. The primary URL includes a 'utm_term' parameter suggesting a phishing lure for 'ms office free download'. This indicates the document is designed to trick users into downloading potentially malicious files, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=ms+office+free+download PDF link annotation
    • http://ilturismoinitalia.it/userfiles/files/pelowewilikos.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132daab821cc---lubiluzipapago.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/96957630115.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/movidevokexobozozijisixos.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140223ae7266---71396068096.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/gekegujibeloduwuvas.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06b763b8a---27102413348.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/6247853.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/xolebibirani.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109060223514879.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/1518405648.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/lapuruxowenaruzeveto.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/tetezigixonesujakun.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/wejara.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/24669556432.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/61352874506.pdfIn PDF document text
    • https://seerupit.dk/assens/file/13280732285.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/51673824312.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161412ce2e74e8---molovubejafefemedus.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/51279546492.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/xugarewebejaxijesijis.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/boxipabuxow.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/fulaguribinetorunuse.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10448 bytes
SHA-256: b24497f5804e372f0dfeac1f2d90fa1ce3f751c08ba8097cba43dd4687819579
font_02_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 17124 bytes
SHA-256: bbb46eff687e0d0233d5e26bab11c3b44a9291d932124be07fbf5b1bdabbad4f

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