Malicious PDF — malware analysis report

Static analysis result for SHA-256 0901b692f505fcca…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 22:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 058e2ce890f5e55e44360a94bdc1bc4f SHA-1: 1afe6b661b1690613f343511b65e4e99f9b71a60 SHA-256: 0901b692f505fccaf6302fa42bd0bd345775ff4f138ecef08db5e06c438c21d3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination or distribute malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://pro-group.ru/userfiles/files/zawokitukovatane.pdf In PDF document text
    • http://nofatrans-int.com/userfiles/file/gasazikegabafofobawa.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/13608815588.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/somivoditijisiferi.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210912072024.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/11807485445.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9b46f72f3fb2ba826bfdc39f6d922c02/bazakapugeju.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3a2q21m95svoi7g970nril7p7l/rokegidujol.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c501401f266eb42b0e87b1bc809a6f6e/gakagijulokisifegi.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109102249331369.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/9108026392.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6acbf833---napadelebidefasolavu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/67437319977.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/zexepijita.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/50637516455.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109070559108307.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/jupujazuzateterovofudinet.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161335e24c5448---xipegadixaronopajow.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tizife.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/kawodowawuki.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/53456880326.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/sewakal.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/18128826875.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/jafikijofudag.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/36442976346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sat+writing+section+practice+pdfPDF 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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 17268 bytes
SHA-256: 4e56d38fc563c36488d0f02bfd31c4fe4c7b847037797c0342a88ffa38a7b02b
font_01_sfnt_off0001128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 10908 bytes
SHA-256: 541b64d2c641599f12a969a1de1d5c1d6511f36daa06326c4a9a8f55877dd1b7
font_02_sfnt_off00012bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1