Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35a923c53e078a1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 22:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02b6ef0dc2b366eae69783e7d215e9f5 SHA-1: dab6e1ca91e580a549ca1d77c5e8e615c689905c SHA-256: f35a923c53e078a128560abbbfc7e50e540fb7ffafc0be3232806e503484e768
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=is+there+a+way+to+facetime+on+android PDF link annotation
    • http://el-system.jp/uploads/2012/files/gijuxudufitine.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/rezedewixupizu.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/97694269708.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/kotifatoxamumozewo.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905151352211213w0vgk7.pdfIn PDF document text
    • http://24cvety.ru/upload/files/91017148223.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/junasetuworig.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/junawurorafodujid.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/serofajuzodininimukekigit.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/witadewi.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/50094359229.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/10051539359.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/tirutifatozofexeraxarava.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/86286966190.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/40a4a84522da877709b5333e40b87f73/sokuvarilivonegi.pdfIn PDF document text
    • http://premo.at/userfiles/file/27050636423.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/zofilijuzuxajawojen.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8eb1dd79e53340f6ae38c8108df64e0d/25383252839.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/53782824768.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c191a208a3---joxukogoxonamelab.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/91044295253.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/talejivova.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/nepawojawitome.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/57491665990.pdfIn PDF document text
    • http://iltorg.ru/upload/file/nideluto.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_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 17132 bytes
SHA-256: f8bbb03c4072ef3e22bd36855e13318f900beb501975b988099d6a4b04ec07cc
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10848 bytes
SHA-256: 79fffd599ddb5c61d5c8e872334f1e9d7fc9243f26750c9fb835fc3b935026b6
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.