Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cd19c7d3a89996…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 21:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 168e6c3643d3ce63b210a95f1a41c9e7 SHA-1: 39cd08582667774ea7965d545b33dc5be9374b26 SHA-256: 16cd19c7d3a89996a82f061ccb999dcb8283176d2f0d2d4bfd5bbe406cf933da
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e0mgscbsg39a8t1ftibhqudeuj/43464363726.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77abb9453---60119031405.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b6768805c8119290e2568434498e19ee/6115821858.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160815a6b9ab27---sedonulipinakiliz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/gajoneputopiwel.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/2a7c44e4bad4d900ea5b4e2e0bc4db18/33831300617.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/lixowobogexewuzek.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609b1f3227---58398238456.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/sujavonokak.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/34877571093.pdfIn PDF document text
    • http://salespate.com/userfiles/file/bikezabisufotabovixoxul.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/lk3q5nb961fj44vi0bjdnotp03/1799642474.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0c6c4f6b4c0f185f7ea4779fa431c354/56278159576.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/xajolutomip.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8ec44b492dd95da1feb0a200481890e6/28801968059.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/takibuwevomajipenip.pdfIn PDF document text
    • http://hainfelderteich.at/56181058758.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/mopevila.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960b52ac7c7---pokuma.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/lanixizikepezukeloxuxame.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/43379458900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=facial+nerve+palsy+pdfPDF 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_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 19288 bytes
SHA-256: f5c2e46ddaf1d3570799e7b7f3052e312acb9003a18a94ec8eae1638062e3bf7
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 10552 bytes
SHA-256: ccb49b6b12877b069580ae11e1311f33ce29018e330cdebb4f58f45184caed82

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