Malicious PDF — malware analysis report

Static analysis result for SHA-256 171aae8f13930f12…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 17:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f730f2f9546a1ddfbd3f946fc5b1d92 SHA-1: 66309aa779dd9dcbd22d9c11952e15e2a24cf1ae SHA-256: 171aae8f13930f129b4eec5a8a2f276d321a49c9aec4f96ccb124b2f9f71621e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic firings indicate a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=msa+redmi+note+8 PDF link annotation
    • http://longtra.vn/userfiles/file/tomuremad.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tabegiferul.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/26021495994.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/16521679214.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/19556023814.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/11558799226.pdfIn PDF document text
    • https://schmitz.cz/res/file/26388433269.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_120455.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/22444917207.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/80278067126.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/kaxonujezawemor.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa703ba6---62327836259.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5ceb1994b0177b5a29e9ed1bf0743c71/59713827689.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/mowevepezunorevaj.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/8375063092.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/45175208740.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/34818787216.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/jerise.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/jubam.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/muxufumusamavokogifufavuw.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1f4caa27bdd626652114476300a206da/32074362705.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/47391155597.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/musatudo.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/tisowur.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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10564 bytes
SHA-256: 9bdc85d14f9640242b734aaff381a68d75fa45dcf53378d586be6e2d84c9615d
font_02_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 14820 bytes
SHA-256: 9ed9d9cbba242a634f0b55c7f040e017c02b39ea2af05d64f16c311270bb1998

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