Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c38ebcbd0613fb…

MALICIOUS

PDF

84.8 KB Created: 2021-08-25 02:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4791db4af93ebefd88906220f348b51c SHA-1: 2d8e05830eed02feac815c66cd2b42901007427a SHA-256: b0c38ebcbd0613fb0c12aa7a1d1318eae6d6583aafccb4e27938ae2b33c925f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=the+best+special+forces+in+the+world+2020 PDF link annotation
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/afa0usoe0a6se6d5js4hdv409r/gugedogav.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/41180565810.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/girako.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d8f396e92---9660636236.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee25d381e---zoberefesadipus.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7708e2015d4fc2b9d2874990ce59c666/ronavujezaluremujowo.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/pederalese.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/40371501385.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/valanomolefedusajopug.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/38257083350.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/24504545509.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9ad90886---todewifera.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rerusudazi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/457a331a4417486f8e113c43ed833387/29079674644.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/32835703804.pdfIn PDF document text
    • http://vce34.ru/attachments/file/83863656016.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/78678399208.pdfIn PDF document text
    • http://abwrva.com/uploads/files/wugirisobisutekuwor.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/bowisuxaka.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/jorate.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/aeeebqib2np449lg6aok2q0itb/26114993968.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2abqvc5m1iqc3pone8niu6ud6f/musisarejakikibimelupis.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 17744 bytes
SHA-256: a87a0e149e72e32a970af9bc619016352f17c3dd3b491db57405eccd13493691
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 11148 bytes
SHA-256: 61726ee178460eea87aa5f79fbcaf32e8d5d16c5a92038bf8ec5ef2566144351

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