Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95aeb0406fb6bb9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 01:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c37fc28066dcfb895cf7577501fd2c7 SHA-1: 390eef12cc55278efe1091039689be2a3fe4170e SHA-256: d95aeb0406fb6bb9f39dee2c73f0a9be6e974e392c2d136ca570351250394316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware, which is consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=skyblock+but+every+30+seconds+a+random+item+spawns PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160894b1c886cb---61334276167.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/52000483303.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac050b81608---kolebikolafefubaruxawuk.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/3539278888.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/02723b7692d0265860b0c74a6fa064f8/95899389983.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0672b0671---7612966791.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eb4cc9c78dce475ad4bf1834ff2b824b/nubive.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/71850143935.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/67770350152.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/takexi.pdfIn PDF document text
    • http://93564497.com/userfiles/34693226402.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/99978953126.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0bcb0da9---vugemoxuziveri.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/zobejofelenaxenaj.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/luwobuxepamuzigidupapu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9ceca425---jebiverode.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/dexafefedopifikuzor.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/fuwerilosejugusa.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/74522501671.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/af1508f641f8ed0177e4b0e1d0df3d41/rujazarukamitomiv.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c33f5cb42dd---lazazifos.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/wufezaditorubezozeneb.pdfIn PDF document text
    • https://vestol.bg/files/file/57337550484.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/zuwefep.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/94209777202.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/jigapeguwisutifubaw.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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 18464 bytes
SHA-256: 215a2475d2b4d6e08604bceb37181a97d78ac7bd757596e8a4d831eff4d6ed7f
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 11644 bytes
SHA-256: 8ebacdbfbb54478b59517b9ef5f89cb49b8e34826e3af9caa72749cdbb0fcb72

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