Malicious PDF — malware analysis report

Static analysis result for SHA-256 563b46db1d27ae96…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 19:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4dc56d48c793c4d25ca4ae0c74162318 SHA-1: 276fcdba7d674c659701f454083ad20af4f36095 SHA-256: 563b46db1d27ae966dc1fc4af5c5c4c81113c08b90e8227ce73c6b0035f6e87c
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute further malicious content. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=vr+movie+apps+for+android PDF link annotation
    • http://classicalgardenornaments.com/uplds/file/60938641380.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/56664447977.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/ribinaxejalakepepobawofeg.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/21607182070.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/delaxebomilumupuwenuraxe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfc44a5a9---14841871495.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-18/20210918032252532731.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/tuzuramijamiworikemukowi.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/39185046026.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/96364414996.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf63d2805---48586563975.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fewanoruvabonojix.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/57201268397.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/toparedameliruza.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/kakejuke.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/ninavepomokukeruponumanin.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210906_153049.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/xodalugid.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146634066f2b---37418664142.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/pideduzixituzapuw.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/nopumixe.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/4478632202.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/19761513618.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/09b99e3c21e84c729dd7e4b3b830d468/xadutapif.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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 10548 bytes
SHA-256: d783b116bb010dd1b1e581c4d4f9eed9ce824d89199daa0dcab20ebc660dbb04
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 17216 bytes
SHA-256: 54b1dd58a25b60557a3f8daf68ea166e719d3abb0b0fd6bf6a2dd78a989844b6
font_02_sfnt_off00012fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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