Malicious PDF — malware analysis report

Static analysis result for SHA-256 914d03f39784d970…

MALICIOUS

PDF

81.0 KB Created: 2021-08-24 16:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47da82ed963cda388e819f102ae2f147 SHA-1: 43c9a4660d5b7fc279994c430612e98cea637689 SHA-256: 914d03f39784d970baf622cb392a8554ef0386953c8667766b2ed46ef415c74c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crewmak.ru/uplcv?utm_term=sunshine+quotes+for+instagram PDF link annotation
    • http://asremajazi.com/uploads/files/juvewowefofuxu.pdfIn PDF document text
    • http://ciskmv.com/css/file/wejejubo.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/72086996235.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fa590e859---gavitugewopejikarokeni.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75027d4d4---50293582840.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/44938403722.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47305531516.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/lanawajutiminerovujekuxab.pdfIn PDF document text
    • http://0048.pl/48files/file/64597721378.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/17601530182.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/63616324316.pdfIn PDF document text
    • http://msiutilities.biz/documents/rezaxavesojagekun.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9722292f77---7073114663.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/84017342364.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/80269275483.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee1100a42---mozubumafopazus.pdfIn PDF document text
    • https://limsurdua.com/contents//files/82008058975.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/41502275840.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc040a0da5---35929629842.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b2ab0438---28456236729.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/2761137864.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3e5034f93881d6e05a8efcad4dc1410d/99926339429.pdfIn PDF document text
    • https://mfdesign.hu/files/file/lexuviluvudanudo.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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 16184 bytes
SHA-256: 356f5e6b3e5d5f4f3e73cfa7f75616d277c794a0a048fcfc4c79452657be1043
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 10936 bytes
SHA-256: 6d1ee19919fa37b0a7b8be94b84e23392ed754676d9c0ad5a210a8f107983908

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