Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b34563b70a60ad…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 17:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a13de31af0fe60faddb84e01f27ae41 SHA-1: 28869d6e5df4ed236baec042e36d78e71fb599e0 SHA-256: 89b34563b70a60ad708909c05e967d6ddbed310b78996941ed81428a55d41679
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. These links are likely designed to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aqua2go.pl/galeria/file/denoxirinemegoze.pdf In PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/novevifuneba.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2910f5662a6cab1ae56650c40d3ef2b/disevuxonadapareje.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/85984403628.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/95214500715.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/50913132798.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/67081741164.pdfIn PDF document text
    • https://sanidom.pl/img/file/pifal.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/31703096795.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210914135232.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/firavukumasibawisiposon.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/36874789628.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091209564156.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/98600815707.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161369ee1113dc---43928218291.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m3scdaldpu39qbdkp92pvss2ib/davunoleriwekagasapa.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/10318572104.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/najixugegetefuzamod.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/jakopatelebu.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/7453865623.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/darusesefaxemivizizewir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+studio+ide+onlinePDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10160 bytes
SHA-256: 0ec2d597ba22053772c582db2873f85f4c3f5055af679049aafdbab2e8ba2487
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16652 bytes
SHA-256: bc9edf0aad0d450e9770f98da8b3946f72e1628aeeee8a190b5832ddf635b96b
font_02_sfnt_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1