Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c2236c6d535adf…

MALICIOUS

PDF

93.1 KB Created: 2021-08-16 22:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 89c8c250669ac2ebeb5fec5f04235d07 SHA-1: 308ff2bdc6ccb8e93615df87a94afa89a4f8ebc4 SHA-256: e0c2236c6d535adf2cac9927f02bea5746c248436614855f79ef2c1928d05348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to domains that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://abc-tel.ru/data/File/12753466983.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8k308rlsjphn7ocsv673rmcjg0/931476334.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f23f36390---33964844974.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/gozasuxiverasugijo.pdfIn PDF document text
    • https://seger.cz/userfiles/file/viludolugoxifalatuna.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/30094880382.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/tuvaxosewovopigifojeri.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/beduzuvebu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b77ed7609---35922781107.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jujekopa.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210801_8A26D7F8F807210F.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/97846731414.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/86717303378.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/movisoromubekegix.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/75065ea4158497eaceeedf2a1032b459/14996424240.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/72157221417.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/gmfvd2vgrj8o78kbmu8vogsa5n/25495838960.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/96548781355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=libros+cristianos+pdf+gratis+espa%C3%B1olPDF 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_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 11096 bytes
SHA-256: d690ecd349aeb93d331d6a2d106cf3b9afa6cca2a9101b03a06c899ddf92fe07
font_01_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 18648 bytes
SHA-256: 1f4ba8565e88b7ca4f5acd9939f4bd909243973e5ed038f9a4a7964feecad44b