Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c31b888bf0eecb5…

MALICIOUS

PDF

136.7 KB Created: 2021-09-06 01:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2160eac5976b3ee788c232b7c55b12cd SHA-1: 1f75b8370acf6377e270245e9ff55cdf10dfdf7a SHA-256: 7c31b888bf0eecb59604460f1104ab8f1a80372552e824072d4854bed42a0126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The presence of multiple external URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://pistant.ru/uplcv?utm_term=metasploit+unleashed+pdf+2016 PDF link annotation
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/de4a43250f7a5f9b4a5a8fa4b8ca6021/fuwapadedufawin.pdfIn PDF document text
    • http://planbmedia.hufiles/89302402340.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/132bb64a79bb2198722abda011e4ba51/bemutupiramif.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/segewekoka.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/doxapefosipetifumose.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/19180801233.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/1335636340.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/83138448238.pdfIn PDF document text
    • http://elma1.ru/!upload/files/8090103287.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7d1f7a753bc49dc8b4fe047b1facc8c/moxofunigikonovetitojuri.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/kawepobuvafef.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f82b933d6---bemevadeb.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/notixoluduxonupukasukivag.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/41260629030.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0b1de10842bfa5675f571d03edb8ba98/69080958919.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7ff51c5af---xababumajizokavolowe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9650d58312---89563957452.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/84036919167.pdfIn PDF document text
    • https://mashura.co/userfiles/files/15689588867.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/rogemite.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/938beb866a659f883fc507bd30905132/74052959544.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/i7t9v1qa9h712117q53fk6btml/xukuxitakadajisejuv.pdfIn PDF document text
    • http://blueyee.com/upload/file/141046245882.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/21528261898.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/bedotu.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/63530653177.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/50434898515.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_off0001ac8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC8E 20176 bytes
SHA-256: 4781992cd1b52495bb06d9d9fb60eaf4b3cafd73ef4e9beaf6fcb5ea13219ed2
font_01_sfnt_off0001e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2A3 11052 bytes
SHA-256: d34f1bb049571731f7914fd5e15a66ce28a13c0e27dae62d99e4e9980b749bbd
font_02_sfnt_off0001fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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