Malicious PDF — malware analysis report

Static analysis result for SHA-256 894868757427e89c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 03:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 908461186f56119f31e4e00dac13a73a SHA-1: abb887ebafcc723e26804c0cf42439fa137406f2 SHA-256: 894868757427e89cfd11d9b4f1f90a7045d4534bcd2d7ef736fa060fbb360273
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a link farm designed to distribute malicious content, likely disguised as software downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=download+photoshop+crack+for+mac PDF link annotation
    • http://osstemcardiotec.com/files/fckeditor/file/80128216661463a75d5821.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/85e9493168dcad2b3ce8f56c9c1a8e27/kibuwatekinanoverikas.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090701243373499.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/40601467293.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210913054654.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/natal.pdfIn PDF document text
    • http://marketingnews.fr/images/file/baxeranu.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/gamubuvivobakebiw.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/vovisamexidowubo.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/56626855689.pdfIn PDF document text
    • http://iknow.pl/files/file/sofupewukajudorajisut.pdfIn PDF document text
    • http://stroi-sistema.ru/img/6382454187.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/48866317453.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210905085448.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gogekemol.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091601345273499.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/65960050362.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130938c67e3d---popirapeta.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/lezasiref.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562a18f76a---1983930533.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/44215068706.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/37449193044.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/47118053173.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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 17696 bytes
SHA-256: 083954c0d7585244b54db70dce034de54e8d2eb6e1a695686b895d69d2ca0c0d
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 10840 bytes
SHA-256: d03f05683b604c75ccee4d38cbd5fa2733371a8d3e61c848b1b3048d657c5a15
font_02_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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