Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f06a8b4f39e002…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 23:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9c8a172a0128148af17c3e8eb55f02e SHA-1: 58055fd957e18f61cb9b7c7de87952e86545dc5a SHA-256: e7f06a8b4f39e002c60983ba6d626f185bfb9554865e6aaa76b967b3974a1bdd
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ff718c84---98229463838.pdf
    • https://skinrepublic.vn/webroot/img/files/60053093001.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/napibuketimijubuxelafas.pdf
    • http://minhnguyenvn.com/uploads/userfiles/file/tuseminojuduwalimufa.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/77590861406.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210912205352.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/wejamuninitanedutajur.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/xuzimamezabegik.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a937777d---22862807997.pdf
    • https://artasedanasingaraja.com/uploadfck/file/fepafuzukujolufivuxavi.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-12/20210912212844584342.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6dd2cdc6---95166560456.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/22fb0a19fa39f6e14ef484714587add3/xibuweviwiti.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/mibaf.pdf
    • https://okud-istra.hr/userfiles/file/sajuxorikapubejowiwusog.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8ba37722---vomatagosej.pdf
    • http://smflow.in/admin/uploads/file/17569941789.pdf
    • https://dorfadvertising.com/ckfinder/userfiles/files/pasudap.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/nimezapawamobix.pdf
    • http://elma1.ru/!upload/files/68399050575.pdf
    • http://unstitchedfootwear.net/files/file/21346855692.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=big+day+lite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 16792 bytes
font_01_sfnt_off0000f1d9.bin
67a1c1112f1ab96ebe3bd4cffa77650f591b7e329f3b6a1d7c02b07ba670dad7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 16980 bytes
font_02_sfnt_off00011dad.bin
408ffe3040154a5c6931e36532656a4c275e704da506059c50022f15c9393a76
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 10096 bytes