Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2508e90dab8705…

MALICIOUS

PDF

97.8 KB Created: 2021-07-01 11:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4dfb278633c4a42f9929697a871bcc66 SHA-1: fa11a97cf2f9b300e5a5dfe054344b74540b4e98 SHA-256: 9b2508e90dab87055e4931689b41ce428bbff8495a35494953272c0d2e6428dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The primary function appears to be directing users to potentially harmful or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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 https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/e31b50dbb602b0b3f89dbab120eaba72/78065363770.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/83bf672a9f3e76a19c5fbd43d4d8def8/nafepanalafofuwitel.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c98505ee758---77818700868.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1eaf5a2ggarlfrsb5nudtucv42/donugaxilonubufimetalen.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/b53ae4cae934d834c9904fb03bcec2f3/78106175713.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843d17c15f9---difez.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5222b8d04---49321423428.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5c39a735f3de39b49b3c2350ec69c934/18956494347.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656d83922a---88104054954.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67d0f36f0---xovadazovurusaposeb.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091a99367c01---xezozevutobaz.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/28717241865.pdfIn PDF document text
    • https://digireg.nu/upload/84517093801.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc946d6fb01---kakiroferixutuzi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vewiwesitiwegikikofigetus.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/84435393241.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/rojanezonawutilola.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2f09eda263dda98a24f9ead3824b964f/tafinuwavazuwanufep.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/daxeno.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a82a6018---sisapozunekazo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/40431042643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+sentient+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 16336 bytes
SHA-256: df819a476868791e4eb3eaea7bf3755ed754743f90bf6bb54ad625e11efc22e7
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10388 bytes
SHA-256: 44673e0ecaf4987fee6efdf6c3dab997d26de6a45c2efa6d038ce38485b3284b
font_02_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 21140 bytes
SHA-256: d71216b9128b9c479df9d870f24b0690dc52ce80b6b32663ffb48bd0e02599c7
font_03_sfnt_off0001550f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550F 2356 bytes
SHA-256: cc5b2db9a6a6bbd90097d1682e077829de236e2055805b0fe9e6d545c622c846
font_04_sfnt_off00015f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1