Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b59c762d367d734…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 12:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c9b3bc5f43bf89d8e1c0cd39c16bd0e SHA-1: b2c5323420e31d865272b426b8399273434a2ed6 SHA-256: 2b59c762d367d734c2b2c18a5be0fa1b4f1069539a803c998102c11e2b60f73f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to host and redirect to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=rt+ac88u+vs+rt+ac86u PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1028414e7888aa97adc5ea8f79125d8b/lupezup.pdfIn PDF document text
    • https://promise-land.com/upload/file/39404078788.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/bopukasetadesinugukoruzon.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/054a83105f588a496c4ef7f0da859ba7/80209968526.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jd0sed55dpgq65sv9m09muecb5/4694154911.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1540206aeb---melufasawudagodixamo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/63669773329.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebcb5dd64---92891808570.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/agjqv193s259e06q698iro0i53/rumotagitozitofi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4271858c8d603d9b42c03b7280e5df33/41242036192.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c34726e57fe---9431853188.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210510102434.pdfIn PDF document text
    • https://room12shio4.com/contents//files/xetofekim.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-10/20210510124357984796.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/49648300686.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c869cee375---gavirosofebupuwogabakik.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/32575751863.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/14970036014.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1140fdca1a---25503232501.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_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 19456 bytes
SHA-256: 23b5b9098689b44b70b6b7ecc09ea4df8f528f1e268745f7f429f4864687bbbf
font_01_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 10316 bytes
SHA-256: 08fe5d652f39fbda2fa6168ebf5c251a4f1f144c5b7c1205133e256c1bd2559d
font_02_sfnt_off00013af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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