Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1cb4bd6f887687…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 01:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ff1275a809602b7a584feaa5db990e2 SHA-1: 8e1e6f92048fbf60c8ade954363178c1e2c1aee3 SHA-256: 7d1cb4bd6f8876879c43080a45d3a9f36c013f6ed5c72a3a4e65d1ea7903cd2b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute further malicious content. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://medeeatour.ro/mm/file/nozeguradifilisirizu.pdf In PDF document text
    • http://permagnet.com/upload_files/file/210901083209386985vmn6ha.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcce99b84b---nakewurisuzanulej.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/teloperiwez.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/30927600728.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/11157462331.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16139db1933b22---94092063745.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/tegigopoti.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/68671186650.pdfIn PDF document text
    • http://surtek.biz/image/files/20150326_031826.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/8482312771.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/gorulixizagar.pdfIn PDF document text
    • https://unaizahic.com/Files/files/sefuforafonodewivotarus.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/likinitakukuwon.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/soloboravopumexi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/66936913167.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mmeft643960lr7qi8csrhhl7u1/25207978133.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/risurulejipojixujununuxi.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/54302661851.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/47882589453.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/20809405291.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/xuvaxuninudifimojuwusux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=call+of+duty+4+modern+warfare+torrent+chomikujPDF link annotation
    • 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_off0000c184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 14392 bytes
SHA-256: 34cf2e2b69ed3cbaa662f3e85fe893b3429db9158fd74db546d7e9d068abf5fc
font_02_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 11204 bytes
SHA-256: 604d32c5f4a50ed93c0a488d0a93b44f9699f2e65e20f8a7b6b2dcc73b34ffc9

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