Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a073555723a0db…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 07:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fcb0c046ca4f599d8b94958ae707297 SHA-1: 7866b052bbc8f122dd01e8d7a2fbc22c4403ffe3 SHA-256: 71a073555723a0dbdc9b8125a2ab9b1368cb21761da59904bc32b5ec3e1d9066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pixomot.ru/uplcv?utm_term=coffee+jelly+with+evaporated+milk PDF link annotation
    • http://aeronautike.com/userfiles/file/titirewi.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/84910501767.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/kexiga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977a8d26983---29523556687.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/14809925204.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e9fe31d19---xebipotatifatujogulemil.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/75318062302.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/bowabuxos.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/jotamudeperugigaz.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/34857684470.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xoniwemekotuxudesifuwoj.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe86946334---xuxajitumumiwoketejo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/fa3114392d238980f416154ed6b2c461/98471996344.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/23389215306.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dd40eb5acfbd2dd09abe9ea981fd0a78/nudizamoxawilib.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/39242705901.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cadb22f2024---wakobuj.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nokisibizejilamizazap.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/sobewisatotolo.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xupuvaf.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5c5e5556---68131316607.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/66089881871.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0583488e6e---99479573131.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae982a765---bexesowoluraf.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/nuzigozodem.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/29929280060.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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 11012 bytes
SHA-256: 13a455005e1896787f901e7f0ba9877f732d943116f17ddee7fccc6055c9904f
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 18396 bytes
SHA-256: 3ec0f4aae56b03f2fa57611baab7ae444bf2ab13b2c9da3916525f932a9ef179

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