Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb14906504630ed…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 23:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f10105d245ff673cb0b566dc14790136 SHA-1: e209ce6b8ff8e149ea72cc63921fcdf98263f392 SHA-256: dbb14906504630ed65780ad7087990d36afeee576161ac86168b9748a59830d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://limadelimon.com/images/file/84323980865.pdf In PDF document text
    • http://minhledtran.com/luutru/files/5731254377.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/bejuvasisoludoxexatima.pdfIn PDF document text
    • http://ux-school.ru/files/files/94481544316.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/74219444972.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/gukoruxuxerakawolazado.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/mibopi.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/sunodobosefiroweporej.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/jusununutudi.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/suritixodo.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/12071283316.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/siduxoxogibunoxigajubuxu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5010c3f2---xopadudesidonidadenix.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/89650730838.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/87790720349.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/xeruzuverefonaxexoverizo.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/kavisusure.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gekexosuzipaje.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340383b1085---jijokukew.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/12014851927.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/25778092531.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/55426488766.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/86ockv56fjrkpfkesdpfroggt3/87725605617.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/lezopetujukebalubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=d%26d+5e+sword+coast+adventurer%27s+guide+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_off0000c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC159 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 16836 bytes
SHA-256: 3007cecb0a62348bcf0627ac91dc1ab9794447b4e7df3f5a18ba4f5e352c9cd2
font_02_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1