Malicious PDF — malware analysis report

Static analysis result for SHA-256 839aa3404cce000a…

MALICIOUS

PDF

91.9 KB Created: 2021-07-31 13:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24c5267bee234319e584359d1b59531d SHA-1: 9122705e404813be93cc00b9396633ebba7a6d56 SHA-256: 839aa3404cce000adc315592fc0bd39c349980890fde649d58b792ffacba0e40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/30b258049f335479d20f1b1fdf266058/87540589022.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4e755377fc00b1124100de8ea937876e/85981785070.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/rewotowanozejawemonuja.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/54244413105.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/6826846482.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/jemuxapoj.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/04cf48ed3d46c9b6a087027410229639/kojababajekefaledivasox.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/jorarovu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/da848249ede7079855f1206359e774f5/9639637767.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i9nts0aup1ntas25qits0ch5g7/nolowodinelepofipexir.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827917a7903---xijuxewoxok.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/zawagogarixulumi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rurel.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/38370955873.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4c3c382d---pufaxobivemomeja.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b616935205b---14463817587.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/puwajojuwuguborofowopilob.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bc1e94b9efc5e1ca875076abb635380c/muzupebetebefe.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o81rjic5jqd2l63t1fsbm8osve/92503686047.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/waribujuniva.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/go0qjpk3gusr91vob0ip71ajr1/lutidoxujixik.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac848540469---85303478623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=exercises+present+perfect+simple+using+yet+already+just+ever+neverPDF 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_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 11340 bytes
SHA-256: 417b858a531f3f429bbdc99c190f65cea4086490d41062d4cd812dc49689d10a
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 17508 bytes
SHA-256: 70a3dc05b714dabda8fbbc96091a459b6c4c73e011437fa95da93ef63456f117

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