Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e69970af306bb87…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 02:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53133b4f287c4e2750870fbbbc858c0b SHA-1: db7ffc091ed48f6ba1c09abee071db1a6eda5ee8 SHA-256: 0e69970af306bb879aa04c724ef82d294d4d80c537b14067a9cde16810c4e43f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites under the guise of providing a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=daniel+kahneman+thinking+fast+and+slow+pdf PDF link annotation
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/pakipovizenapozewobatajif.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/69586889948.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/80501555873.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/31198778775.pdfIn PDF document text
    • https://kratky.eu/files/file/85225421192.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/novibilirodenakogeze.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/12999887630.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133e89bd4e66---kaletapo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/88181447123.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210907205956-topogudisotobapuzaxagipak.pdfIn PDF document text
    • http://caythuocnam.org/images/files/52553034067.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613103b504d9e---67311873924.pdfIn PDF document text
    • http://acelybio.com/upload/files/58034842714.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fusegabivutovogopebegi.pdfIn PDF document text
    • http://szwygs.com/upload/vikifurifuzefodupisiko.pdfIn PDF document text
    • http://kyea.org/imageuploads/jusamin.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abeea6b533---75090968350.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/80732366061.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/88297126917.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909021328.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xebosexanuzabidozoduba.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_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 17696 bytes
SHA-256: d6a9a8b9a2253c2c65389a2fcabc225809895e57a12ac24035e4742185e32db1
font_01_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 11024 bytes
SHA-256: c1cc261c43e6856d1514db14041fdbcf9de75f0f1b835c802cedd81d25967f49