Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cc90371b8770a9…

MALICIOUS

PDF

86.9 KB Created: 2021-08-11 05:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a3f2f3041847ad5273595df16b5a23e SHA-1: 9103785d37108c8c6a67088bb7f2c4ebb3f1cd8a SHA-256: 00cc90371b8770a979b5e13de970879f1574efd5646ad1f677a27383c48bdc7c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as does the PDF_URI firing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://duetsepolno.pl/userfiles/file/gozubimemasalo.pdf In PDF document text
    • http://arcomproltd.com/userfiles/file/pumelizonemaxoxasadexor.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/jadupe.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131d207f8b3---waxijamax.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/nobatujezepimerufa.pdfIn PDF document text
    • http://polletnv.be/uploads/files/49047645632.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba97aecb29---16675756132.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1cpgpq5qhtq4vri1213veldpq4/49797288638.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/86264482135.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ohkk8gtmicgnelgc1kudrv5om3/16559615392.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vufinukazulufunagig.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fcpbumba3keg7vglok2du46q53/dikipowizebegupejitimixas.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/18141608283.pdfIn PDF document text
    • http://jarosi.hu/files/file/padirobesulagiwegegibowo.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/96795442869.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dlrli2eu5mkbej4pfo8o7lmgq5/jetolezuno.pdfIn PDF document text
    • https://grnca.org/img/files/files/17141233950.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c733681aeba---55627387067.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108e82091d20---sefasanomizamagusilove.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fofijazotijevara.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/lawanoje.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/13516114027.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e2ed25c70---17550387453.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/338ffe0189383f9f0abb0e7b35e94177/40293773353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=make+birthday+song+with+name+online+freePDF link annotation
    • 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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 11224 bytes
SHA-256: 365d20a901a3859c88d91580cc5df1435a66f456a8e158b825808f514b2cb9b0
font_01_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 17588 bytes
SHA-256: ded0555a1e2466619515611982f6ea0315bcae9fe1a5be73ede94eb4a35b7b33