Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10de06eaddb11d4…

MALICIOUS

PDF

84.7 KB Created: 2021-08-30 07:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44e73497db8f829155a57f8a25727cf8 SHA-1: 445e96c1a94741229aa2b538c853ad7d387a9925 SHA-256: c10de06eaddb11d41b04fdf64c629e141ef4857d73d5b0180fe2198ca43a6054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a malicious intent to leverage SEO and compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cattaneoarchitetti.it/userfiles/files/kiwokutimegulirivulex.pdf In PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/sefarivezaxelabudo.pdfIn PDF document text
    • http://www.heksan.com.pl/file/lorasijivevuselarujilig.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vuwudanijidegijepuko.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd579722a---zewipojipegogazepeputik.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/24423504003.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/c4jnpcth5i8d2lc0g3hjhidhr2/xudowutuju.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/88156904669.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/zasijijaxugodevobipoxo.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/babegijumivukezowefokime.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/vegaradotonuvuvos.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/33438382362.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286dc7bf14---37197739833.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6c25a65a01fbb3d6d422cc39fabc7fbc/73132941860.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/35df5159e9c37bfb51be21f8c0bf2bee/95504957865.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a631bb966a1---tijunuparejatevami.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/34316115589.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/80906193772.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/744586845.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/naneteraluperoni.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7v36rsrl1e7kd2rha9beam42hb/lotutejotosax.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6d7c63bc4c73bfbab45b9a43de0a6431/fekujuvenurinotofopiv.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/91610946787.pdfIn PDF document text
    • http://simonide.org/userfiles/file/busis.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/xewikonuzefeleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=naughty+texts+to+send+your+girlfriendPDF 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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 17816 bytes
SHA-256: 4a77517baf0dfd657b4d0d69c5891ef8795ae3a6ad08f181368b428b2d76e252
font_01_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 10924 bytes
SHA-256: f152c7a1169f4bf66950472cc975cc1c2c3b5fb93807c8ef460e43b167d72aad

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