Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0723cde8dd1b8f1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 12:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 76d8c8f6bc1e10f6b237b367a09ca8fc SHA-1: d87ace66be76737bb92e017947c9491cbfc74645 SHA-256: e0723cde8dd1b8f1162aa631603516a0dc10cc58d9f5d9585118752284f607d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=instagram+profile+picture+full+viewer PDF link annotation
    • https://magnettoptan.com/upload/ckfinder/files/9659010753.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/giwupakajoteluberofeva.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/79895025453.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/280662240.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/liferasuro.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kogewuxababiwosaxojawiv.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f21132580da8c4a9e96a0e4a4eec297e/makaline.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ae2918bf---vubezefidugasasilizoledo.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/14960663486.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/larugamijisenawope.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/13983681756.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/29958109894.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/57156190183.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b453b3a7e0---padebijijasojop.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d4a4165aec5fd0a3efd74f271b5fc599/54754556201.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/lamonogilo.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/2648826176.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/83437418108.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/22364025708.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/48303767576.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910045918506031.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/gemoxaj.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_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 11028 bytes
SHA-256: 9887f47c38c7b75d81de283510c8127aaf0feb58574740fb1ae30c6a032c75f6
font_01_sfnt_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 15432 bytes
SHA-256: 161a30effbcd2012ea7e143924704468a4d0d6687053f30c86aa8a336de0b9df

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