Malicious PDF — malware analysis report

Static analysis result for SHA-256 b780ba7131c9399c…

MALICIOUS

PDF

71.2 KB Created: 2021-07-09 09:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9db2435527ee60d2194a477979f4efb SHA-1: 8ade5ca6e063212488c8ed10117332f6ecf2b84c SHA-256: b780ba7131c9399c9683f023d8fd662819a11a62fd71df6adab7e272bfd9f0c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://cructi.ru/uplcv?utm_term=photosynthesis+worksheet+pdf+answers PDF link annotation
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/420774e6f6ab6f81b13c361f00a4bf26/74534994408.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/vaguvagij.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/18997087024.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/njn91jg3bk0a5fd6m7uq5mlgik/dodurirakubirosanumizatu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36f88fd0b---73619503898.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/85212987772.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/46a02ef01950209953f88541f7c7a3b8/29486589933.pdfIn PDF document text
    • http://primaneighbors.com/userimages/gepasexapojebiboveras.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4be3c7991---43370927998.pdfIn PDF document text
    • http://allasclub.com/campannas/file/golebijepe.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/91008104877.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n8fn033ohfj9tvkriuk9mqohpc/93624400000.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9e01ccd17f---60545526960.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/28vks100np5r633g5c9l2c8ag1/furivimosusojudu.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/temupuwadibevis.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9c680b3a0---dawuvole.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ad6b4ee88c37dc69e8fc39c45b62f0eb/rimejujijuvibixoripim.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/rumojomavumiranogori.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2a099fd46510be3e0522d935e13beadb/perafagudedul.pdfIn PDF document text
    • http://firegallery.ru/img/upload/posilizazoguxu.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/xawotu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9d0162aafaf8d084a88e0081525a9d85/wiruzawimogisaxup.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/88bba16566a4768842e081bd42d625da/42938515151.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/demegugun.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/bupavupunasewiwejozudufet.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/83629037504.pdfIn PDF document text
    • 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_off0000bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 10844 bytes
SHA-256: af99742dbb929e7873fbd66891db0f4b615d89db373ae7d4acbae243bca549d4
font_01_sfnt_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 14052 bytes
SHA-256: 7860517d91d899ef7b6f59c39b4af6a46f0eacab4750e245cf9d76394e4db0e5
font_02_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1