Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bd097ed7e1dc71…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 08:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 011ef61cfdd48140b9ad117f1acb0a9d SHA-1: 77eaf81e74f33124fc2eaeaa302a9a61e89164ff SHA-256: f9bd097ed7e1dc7100befa2d10b0ddfaa8277f8fc1c00864037972451ee3e71a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of external URIs and a link farm indicates a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=ready+player+one+pdf+download PDF link annotation
    • http://studioprogettoarchitettura.eu/userfiles/files/76184079092.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/44566684675.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e090ac35b72eb05fa82adaea9c9f9e1f/tanoniwej.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/kuboluzulutume.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/tefegexesivemeduvogo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139622ce3d5d---80328263931.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/benuk.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/33824271702.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/28625910230.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613221cdc85d5---geguturebufus.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/lowepovarepugu.pdfIn PDF document text
    • http://school15-tyumen.ru/f/rirujatepagenoxefan.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/mukegemubapejisiwumenuza.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tikekepemunina.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/samopokolikejudelum.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/xabupivixutonanikixub.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/62449922139.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/jemovorokifuxitede.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/50822070956.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/98610839380.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/34299676639.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 17468 bytes
SHA-256: d93dfee7da183c380c3ebf52accfea324439d741cc694af77af411eac6633715
font_01_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 10380 bytes
SHA-256: 0fb41dd61e21d1cdd005f4b6f9370004d43b368966e17188f9aec7b44fe04c3a
font_02_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1