Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b6c76a24400992…

MALICIOUS

PDF

91.3 KB Created: 2021-07-04 06:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 044706a670503be6ec111e9ce526afd8 SHA-1: 9e1f6223aeb7fd0c88370e74d0f85a9ed680e32a SHA-256: 12b6c76a2440099232981140b23b25cbe4afcbe080b0c7efa5d705b892422d15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=funny+beer+league+hockey+names PDF link annotation
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7gi1q10080e56oq3llhh1ue6v3/nulopuruviguguvubumenu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a2f532d7aefcf1c9ae46978d721a06d3/93886838923.pdfIn PDF document text
    • http://mesterek.net/tmp/86693136917.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/14724485576.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/78568139418.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gukotugazojodazaridabur.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879714b1744---sawixutirafivujep.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/2158573448.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/6781884672.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ec4953a3---vevugumoforimugofawope.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/teximenenasono.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/49ceb327da3f599f0d66cdbe04fa6b5c/kolonekomi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3edc12ea---xisup.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/kexidipiganemezidosewipus.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160820cedebc30---80706651003.pdfIn PDF document text
    • http://kodemari.info/data/files/furojusisogosabebekupod.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80cc548d1---80459108790.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/20203369045.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bea460bc9---voneku.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/83168430279.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8fb430f---rimulorisuwode.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c267692b---99595032797.pdfIn PDF document text
    • https://kham.vn/userfiles/file/66899834984.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55f1a6a97---25694946661.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/51321425276.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/03078cc4b9c8a4179a372ac1eccf18dd/54672064379.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_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 17268 bytes
SHA-256: 77c3443d65755cd5d84a4c4ccd47688e209b73c6658af5200a4df4acc794c88e
font_01_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DD 10912 bytes
SHA-256: bcabac503cc7e51d48ef1024009b83c99da2ef7feb39f9839d09361d0b62c7ce