Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e3cb513aaf64d7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 14:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e7a22f530f52c5349d24b96747668c0 SHA-1: a94dd22e3b9c583139df0bed7b5ca9e552cae7df SHA-256: c5e3cb513aaf64d78c1012978568421bfeea8ba1deeb05d3d6d41c89ee58e3dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/80630089407.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c653a1bf---kogiw.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/kisomubomamafitoki.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/41362822417.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/10119498932.pdfIn PDF document text
    • https://memoservicesrl.it/file/93471289426.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/49434485355.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/5bqsrjlsqiftt4b20f7965eck0/nudiwudifaduranekel.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a01106a28f0733e2d5fec0c4b686117a/ludobitir.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/8063043184.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/nutoxivawu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/doapikbl399b33b3dvnvev05dd/koguwuzobukoguxuxeruduvis.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0dd1b16d475eb85f3dd3e6615391e97b/kunezinutakaz.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fc53a543376f32df8dd6c461a860243d/musafewifiwedawomapufivew.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19a00ae1693666929c010ee3c3f0abd1/76231100665.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/manof.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/51551984627.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xoledabaxenowagaxirezufik.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/appg26ve0toh35enbfbokrem08/jiwozobud.pdfIn PDF document text
    • http://hanifeugur.com/image/files/naporusevuwajizek.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4954d999360cc13a7546fd3295f329fe/ziworotujopisuxuzidapova.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/lozalom.pdfIn PDF document text
    • https://waroproject.com/file/vipopulimurufujuda.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/95392382720.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/54921504376.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wobifobilelukulek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hotel+italia+buongiorno+pdfPDF 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_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 17644 bytes
SHA-256: eb3d8263200e9a3128e3f75d6d8e8455742111cc662900e39f9360b6e87035c9
font_02_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 10736 bytes
SHA-256: 2e2fdcac7dc34f6dd62bb4aabc67273b3bdda85e60e2a07b94c564e5ebfa4874

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