Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c59a2c7c36c1599…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 11:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c6154f0f1f9a46ad0928fbb03904d17d SHA-1: 975419176027b2563c4db668fba9d45aa4c5a882 SHA-256: 2c59a2c7c36c1599c0ea9fee1748d78ff38bf5b48963c778bb0a98f8ce0533dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=download+asphalt+8+mod', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=download+asphalt+8+mod PDF link annotation
    • http://gimhaejazz.com/fckeditor/userfiles/image/mujadisafo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gonexavadolivipageg.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/97868888287.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/ximodurifekurusewijutagu.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/kuvagunovit.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21e700420---satupitakunutevo.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/57444586574.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/22044683554.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xinebulubosuzamimel.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/jukisexulu.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/xononoxi.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/89955964122.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/538a56c147219fac3100718611383da4/daviwiv.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/22507226132.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zadapesexeberovokowaxizuf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/odeojgrrur9mk1mqp1l7a5h4q2/57541460014.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613999ff1ff7b---tusozexibelitilomumizutoz.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/8913530587.pdfIn PDF document text
    • https://ratosatu.com/contents/files/luganumelisuxetifuzima.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/68668417710.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/98138032064.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/2146979475.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/44941647128.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/nufekusilirufu.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/99356499539.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_off0000beea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEA 16272 bytes
SHA-256: 4ddf705ba604450c5f13d79736823655625b4cf9b162b1028b2f184b7b2ca2ab
font_01_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10628 bytes
SHA-256: 313be5cdcdb4fd5423dc0d112046c4049ea3903321acf2a538bcb9ad28501f43