Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb70a19a90c6274…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 13:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fbfd31e8ea369b79c49e6ae10c6d9e01 SHA-1: 49d594b9e49d2fa3a2f382a401c66d731a8332f0 SHA-256: efb70a19a90c6274ee2d3b5981969ff2cb6c621cfa3f032efe9af952d89242b4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://degeninhotel.ru/admin/ckfinder/userfiles/files/jirozik.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2d66d4cf26665b914a288daf7f11af5e/17570152117.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/55083678589.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/xewifatof.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902083617.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6c26b473b85c2811627f581b2ebe07b1/95107957874.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/surur.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/34401906333.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/resozadekota.pdfIn PDF document text
    • http://arucax.am/user_images/file/59569439827.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/wipibaze.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/74558603043.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/pigixalobupev.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/dejojixur.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139dffcc316c---rinojisesisugenerojava.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/83700258260.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/19435854876.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/tivawiwowupoweguje.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/99068049789.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/vitomesukumixepi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/loriranelabekigal.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/15831492387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+mbmbam+tv+show+online+freePDF 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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 18176 bytes
SHA-256: 4d1f5a472c0ebe0d6fa2d214d30681ccd899bc45cf6ba5918eb713b301138055
font_01_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 10884 bytes
SHA-256: 9106b66f749b8f50644db5ec424cd134c6bdd29c6e0d28ed0753eda0911b48b3