Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16eaff3ec5d7bfa…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 21:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2975cdd410e058c267079de3aa332f19 SHA-1: 646c12609efcdebfe64535192287e6e2ca1b3720 SHA-256: c16eaff3ec5d7bfaa18d2d6261bdc9efeec7b4bd234a16093a0aecfa3f828566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b1770b4069cac9cee1c3d68851f9fee4/zopumavarano.pdf In PDF document text
    • http://bagliodeimille.it/userfiles/files/koxogekalejuzurixarid.pdfIn PDF document text
    • https://edusfera.pl/upload/file/3186348238.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/37316962359.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912195456.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/xaruxilibe.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12136350925.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/garujuxe.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/jaxiruzez.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/24248103020.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/nuxodixosumirukefuniditit.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-12/20210912083415262108.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/nobozafow.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e6e0453c---norugekojirebib.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/25353872933.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210901120825.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/9142394709.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/gafizetesiwobul.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/1dnqsscsvbesbctcm76c2jfbj0/wujajulezesajadu.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/novavugup.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/nibewo.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/woteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=free+minecraft+for+ios+ipadPDF 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_off0000c4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 18324 bytes
SHA-256: 1411f24b69abad2aeb1aff530aa4a5958410ac1961332dd9d381b3228055d3b6
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 10712 bytes
SHA-256: d66f45270857166e2dede030711f8afcc6d1898b821087576697725285f38dbd
font_02_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1