Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8eb3807ce7e7174…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 17:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f91251c29f30a1aef1df6b5a1869d1a SHA-1: c45c5ba32f593e881d0887322e54ae0a845112cc SHA-256: f8eb3807ce7e71747e16681c237bc287edc8c85c0895432fd18258d3525171ff
156 Risk Score

Malware Insights

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

This PDF file contains a link farm with numerous external URIs, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users to malicious content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=big+bang+theory+season+12+torrent PDF link annotation
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/jobozoxetizojux.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16140ada4d9400---12929361627.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090702525573499.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/6709841521.pdfIn PDF document text
    • http://learningkey.org/userfiles/65495469739.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ada8cd42f62c974b064243827142ca79/sezofogef.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4fuvmfp2svc536182lgamntgi4/roxitowumesudubigato.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58574546647.pdfIn PDF document text
    • http://cecev.com/stockages/files/nixuv.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/3512033836.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/tobenoxedufexujatiso.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/wumususe.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901163520_306024895.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/94958298001.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/86074695706.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/sozifinugolob.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/tejarilafudojiluneb.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/dixokopesap.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/61028161164.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3cc6020caec8c2d6766ea07094c7c1a6/15717847823.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6879b5c23---85467857304.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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 16512 bytes
SHA-256: 4227993deaa599bc426ff1157c256d605b987403a2dec839bbf97b27ad140369
font_02_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10820 bytes
SHA-256: 3e0d6388818f52e12126510be4bdaa3c9c2a95f666c8847a0aaa95f9b10ec451