Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e190ad3a99e2bb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 16:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4ffbb2bccfdc39e65233e0a86724a20 SHA-1: 842695855ba1a46a60a838933c0f4216f13ea592 SHA-256: 62e190ad3a99e2bba7252865777f848762f4a8a0735addb3f3976cf87e53a1aa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=city+apk+download PDF link annotation
    • http://peaceinsrilanka.lk/userfiles/file/xilaxazutagalotekeda.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/36069076037.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/waninevakelodeboruxilutop.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/85618001332.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/51583353116.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/3517365318.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/zazavupopoxuwidosit.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/jubawenul.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b716ce3c7---sodigapot.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210915220610_zmz8ip.pdfIn PDF document text
    • http://onlinevay.com/upload/files/87533076852.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/50525981629.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/cfe0be26434bcac8f4576846711a6fea/wunetobewesikezuw.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27f133622---jixebagifixawuzuk.pdfIn PDF document text
    • http://4darchitecture.org/img/all/21780296594.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/87017923561.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b66c9d176752d6fe01f2cb3be85aa666/xituditovijokolelamak.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/rowijerisuwujapabuvur.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/4321702091.pdfIn PDF document text
    • https://bem-sa.com/img/file/lomugutagesupuve.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/56865982938.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/62137936180.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/xapotufasuwejigiboga.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/3075197309.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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 17572 bytes
SHA-256: 57672396e70d12e77bda21ddfe930a8c659ebc3a1f591252641e866085f69bfe
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 10308 bytes
SHA-256: d8d8efd3f8601f1b7700dd28c77cb73c62c9ea4e213369b53469dec6b575c250