Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c79a2c9575b75e…

MALICIOUS

PDF

71.8 KB Created: 2021-06-27 23:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef0883bd16602846f4059b6fa33014b4 SHA-1: f2770f3f4468ceae679516b3db7fdfa7fe62179f SHA-256: 14c79a2c9575b75e7440b8c9e49496a9012eb1602c37c9c45a854827e1b54c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://primer-spb.ru/files/files/kuzumepawivifolomab.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c8f302275ceb9339941488ebe05e7926/38328797029.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/bovanitaraxiva.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1dce9fd8f---14180467227.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c886bb79f---61864180189.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8a929970854bcd60a0ea22bd7f14b145/tubitebibidefozoribi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/10888640018.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/4129751745.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/uutbuah8eek3f6jhrhngeqa552/66160561621.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/kumikexezu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/17fcb79890827089e3852a5c3c593ea1/kixifazexusijo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0468093001619780405.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd52175dfc---37536397588.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/niveruwobojaz.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/16428204748.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/gopabozamuxesizeketitamad.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/4t5v9hf43112f3po0ctgidf011/zaxomalu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/jelopujonosajeti.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/013961bfbd5a95190b9279040fcd9302/68463734377.pdfIn PDF document text
    • http://domplus.su/userfiles/files/17048346811.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/jeselexajenupaf.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/33907809017.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b559a27324---55206418587.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0a6e555c299beaa64f43cfa7051a79d3/22521087316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=stirling+73l+electric+oven+manualPDF 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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 16160 bytes
SHA-256: 21e5b00e3711b87a6ee84f1397a3e643b1558b2e1b0787c76799c24492eb0833
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10868 bytes
SHA-256: e75a07f6081e116101f064b7bc2c85de9af9c2c1cafd6b0f0e4455f1b6d4ced2