Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b81c1624c3e13b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 16:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a4c00b2ea3b4127ca9b5ff40ec36978 SHA-1: 1142de757ee92cb1d8c0169305176aa456a1259b SHA-256: 83b81c1624c3e13b2eea4bccef58d1241c9710415b589d7fa3802b688907c47c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or distributing further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=extreme+car+driving+simulator+unblocked PDF link annotation
    • http://dobrasekacka.cz/userfiles/file/42582969755.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cplma0m2tt5ll3f6hc0mq0q13e/muwuxazatiku.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/xuzodaxizewomorenewak.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/38224720846.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614084616c30f---rugolaba.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/dokeziwuvozoxo.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/pekomatobadegomevarumufow.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/99164926461.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/xevodebedu.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/xoposamakiketib.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137821b3fd62---xoxusoxavenanaxuz.pdfIn PDF document text
    • http://benetalent.com/upload/files/65405230075.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/25638230509.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/fuzumiregonudunekufi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///82461562477.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/dakikinip.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/91428653050.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/segamakilaliduwix.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/jajutozevizapeta.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614581ae3f09d---24233473137.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/dujazapivemed.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/87664923698.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/didulad.pdfIn PDF document text
    • https://buyafranchise.org/files/files/11164338770.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/96782034667.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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 15912 bytes
SHA-256: 86730f04d98df8bad4658c95951c18609ce358ca918acedf7fc678f4a1e7b470
font_01_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 11196 bytes
SHA-256: eb28043944d3d5b3f17cd41e4e9173dd94cabd0701ebd4f7c400e77c3053dd13
font_02_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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