Malicious PDF — malware analysis report

Static analysis result for SHA-256 b371c39a223a15d6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 09:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f44393bc26ec1bf8127082d138a87598 SHA-1: 7e549cea20388cbf4cadf1afd2e141ba984f26be SHA-256: b371c39a223a15d6cf04716f4f908a236697072cf0bb59fde967607bcff0f2b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO poisoning. The embedded URLs, though numerous, do not appear to contain executable content themselves but serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c9149d6be---95704162662.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5e180e8e17f2a7ac028616ae1e2216e9/fotorobajasukuxonuj.pdfIn PDF document text
    • http://holzweiss.at/xitegefubuda.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/luroju.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1833294f7---regex.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/midonufebetovisufe.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/faxabu.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/vijuxexurukekofaxe.pdfIn PDF document text
    • http://yilip.net/userData/board/file/72060388435.pdfIn PDF document text
    • http://ipceurope.com/assets/file/39385813790.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fevusesabojiwalusejufil.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/wawar.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/nekudi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b69446cacb---33809520518.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wakufepetewugodelijan.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45863a3d9b---13880516773.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/69508599444.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/8106637599.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210516215452_c7lxgm.pdfIn PDF document text
    • http://josquin-capella.de/download/54586743606.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/gixiwigivowun.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/vivoxik.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/wavawuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=properties+of+electromagnetic+waves+worksheetPDF 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 18760 bytes
SHA-256: 186fbda098ee0ada1a75fda77126405aebaedf2449ddddbecd9e906a23f902ec
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 11172 bytes
SHA-256: b8b01692678bf4fc07cb9b37b203fe8ea1690b2c4bcdc7fc5494538fcf19d512
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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