Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ecbd254a56e799…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 12:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34b8681cce44f354b1c7c3602f877e0b SHA-1: 952dffb7de3d97973af3c71b2005a08c652beece SHA-256: d4ecbd254a56e7995d21f0e818f31e89213332c1eb2fee0abd8f2710c9024872
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cleartunemonitors.com/ckfinder/userfiles/files/10989023760.pdf In PDF document text
    • https://comtraining.cl/userfiles/files/98714001065.pdfIn PDF document text
    • http://land89.com/ckupload/files/88655818884.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/vaxefenakokixodibilapume.pdfIn PDF document text
    • http://rilta.net/userfiles/files/fobufuxizolezikexoxivo.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/969d366372d991b6c38accc3ce3ba72c/44318614277.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/podugepelinux.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b6c38278a03a5a381918d66486c68ebf/45905480865.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/46924901370.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080b988e4cbe---60148235814.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/73520219159.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/rudagoperojafovijifufo.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/49617289828.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/88689486592.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/lkbu1pegb7lm3a6110jpcl3kc0/numekovagomozivolitedi.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/neniwoxivujupuxasobososa.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/76e7a56c6ae364e91c86786a6fefcbd4/8030040112.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/kukejilunivi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ca6ad1c2e5091ca7224a82282c5cb427/bozefezagufi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d19579eb5e6---xoxopelapunagedovugaxeza.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/82592358055.pdfIn PDF document text
    • https://birudongker.com/contents//files/vusifalusegez.pdfIn PDF document text
    • http://prosquash.by/data/94060035800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=le+nouveau+taxi+niveau+a1+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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 24988 bytes
SHA-256: 3406a561fdaf2cf2d392eb44f244256bb0eca52e41dc172d2c28ede70aaa8f81
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 10456 bytes
SHA-256: 9f8ddfc44796d7c177b5e072303093d6e5a8eb35a538808e17d3a306ec949e3b
font_02_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1