Malicious PDF — malware analysis report

Static analysis result for SHA-256 a609a873eb846ed9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 05:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 171d9a9dabeb9fa1511324fe08bd89fe SHA-1: 742d2f5d7463022201fca5b65743988851fcd8eb SHA-256: a609a873eb846ed9eefb876c073cdf0e86189ef06354b24eb57ea23843059460
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78552379158.pdf In PDF document text
    • http://3q1p.com/upload/file/210913183734148502fhdaew5s2pat.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/biridovuzenubut.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/xilifuzedisubiwu.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/51580532156.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/56403577051.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/pukedoxegikefakup.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/8694724373.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/78430006118.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9319bb1b---vixavapipukedopolafako.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614896cec5e72---1039945727.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/22986096009.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/kuserowegud.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/jiraxevokuvusojuson.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/51911396896.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/bogot.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/zotazix.pdfIn PDF document text
    • http://winso.tw/userfiles/file/61186777862.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/27868587871.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/49138763371.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/vukodeto.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408070eae94---62627396993.pdfIn PDF document text
    • https://webrobogo.hu/kepek/40880306958.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/takamejegufav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fortnite+alt+generatorPDF 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_off0000bb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB50 10092 bytes
SHA-256: 0b6aa1a7b6babc46dd8c98802902d0d180b78ff4e2284cc347e57e3a67949ec6
font_01_sfnt_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 16988 bytes
SHA-256: 958ac17d713d97e1d45f16ad70ea4c967071aa8b142c86156408122aa5384984