Malicious PDF — malware analysis report

Static analysis result for SHA-256 339e6eeccbd523fd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 01:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5f80f67ff9d0850cfd6835ae75c12fb SHA-1: a4c7e1fad7b24a00c6816ce2e031c6854fa9a268 SHA-256: 339e6eeccbd523fdd91fc9f9e2735f0c2741ef3ef8adc8416a78b5a304163a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/mugemuwogoteg.pdf In PDF document text
    • http://aihyang.com/userfiles/file/mikov.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b8f8e92b---zuwegom.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/54202636047.pdfIn PDF document text
    • https://baongochoa.com/upload/file/70007927710.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/33161949313.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904141703.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/37139165776.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/89860585839.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/kebogusazutub.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/xofimikugaduguz.pdfIn PDF document text
    • https://adci.vn/data/upload/file/mezoxak.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/34094025535.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/kowerirenuxegapurapexire.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/43566459602.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vapegatimawobewula.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161422e1490382---29936456785.pdfIn PDF document text
    • http://maksimetall.ru/files/nidir.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/7166993080.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9ddbae55---40779824896.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/zidavime.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/4f8cce0602a1bdc30e1de35026f95443/93086416155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=poco+x3+nfc+pakistanPDF 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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 10560 bytes
SHA-256: ccf97ef498f52b1343730c35bffe3b3dbe5f06257b06b1ad0a22518f39fffecd
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 20148 bytes
SHA-256: b7086fa9bef2849c209425fe6a2faad80886011b8fafc303024bf4a49172676c