Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbf0e8d43fd12b1…

MALICIOUS

PDF

86.6 KB Created: 2021-07-04 08:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6e1c4b9ad6de681f1fd1f86205a618b8 SHA-1: e079e97ecd75dc2ec7eb21a8da9927c794a815cf SHA-256: ddbf0e8d43fd12b143de4e912202739b42d792fc9d6c6023c23c9ce01d0307dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://wastran.ru/uplcv?utm_term=eeg+test+is+done+for PDF link annotation
    • http://fzsvybbs.at/userfiles/file/zepenedobe.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/fikagikoxinozenivizuxol.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/69384362128.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e488747b---vedofozuvarotesedubizopi.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/52247651295.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075d04d6edc7---67152704218.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d93b5c1d76---80113908912.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/63730160463.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a661cd2cf---28590510538.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/17231189441.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/35938840695.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/29625290296.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e4b191b80711b218f7fcbffdc22649b7/48768804133.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/fuguguwe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9440f37ac---wukik.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/68695671720.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdee958c34---pebofenurumapameg.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/46385277445.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/wixogiv.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/jebogiwisipipoxo.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/lulimerurowaxigurelar.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/b31151e78908c290a5e98f6fa19d1b4b/liwemasawes.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/5634973710.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/69354409188.pdfIn PDF document text
    • https://esz.jp/img/editor/files/finako.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tebofonixej.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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16844 bytes
SHA-256: c2ab0dd6d0e43c23c18f1d374e7cef14efb59bf3a20a2bdb2623461852b83658
font_02_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 10304 bytes
SHA-256: dcf594f820b33ce64f78ac3793e2e81a0fef80eb8475a5b0e009202748b76767

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