Malicious PDF — malware analysis report

Static analysis result for SHA-256 b867c9782e1089f2…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 04:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4cf0830547af20bf0269829fd2bd707c SHA-1: a43bdfc4c5b83aab8939edae7a4b4ac0d0edded7 SHA-256: b867c9782e1089f29906f3fa69efc80b25b3ea26be5a548dadad3b3a886a2746
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating a focus on exploiting vulnerabilities or delivering payloads rather than user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://csn-alliance.com/data/files/japabijunefumise.pdf In PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/24e3786ab23e0b31c26b724ef880d90e/dixapifakafibujaga.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d59b5793e6---89219256849.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/bidulo.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/34278f2d810977adef3129e2f6dafccf/deripagakexanimawema.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/77155830835.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/fegezosenutazatowijovewa.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05f995e140---gujulurebunizezagu.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/zimito.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16084d375bcfea---jetorexowawusejuton.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626954b8b3---54362166215.pdfIn PDF document text
    • http://axwelindia.com/uploads/38811316502.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607035c6966a6---jidarigiruvububozobo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c43e4de34476e3ab06dc9b035f9e14e6/32797606236.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7ba81d09cdd4093c2362a5bd1c86f781/30433870267.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ovk86gcmheqluetcje3ot9ggdn/wifab.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/87087655545.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/krar7ut073351qtu0o35cmg210/80341078428.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44c20448e---36734249485.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/59164949875.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/557474502.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/85b9c3065ceecbe731208448c83c3495/limodigu.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/59549902594.pdfIn PDF document text
    • http://canvangdientu.com/images/file/vurixaj.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/junemuguw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dc420e920181ae04ed81de22af2ef0bb/labokexapug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+is+16+oz+in+quartsPDF 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_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 17088 bytes
SHA-256: e1e247abf1970e2225b0bc1c3f70718cce15074793541a78e77996f4305ae38e
font_01_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001347f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347F 10920 bytes
SHA-256: 9234da75d804d179a36176474c01abd52cec8e9b0b03df4b1f763f202cbb808d