Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa45cdda41754ff6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 05:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6976fb5435de913957b091bf4bec8007 SHA-1: 5db058427c1eb553e550ccca396fa85dcac3a674 SHA-256: aa45cdda41754ff6c7a91a4749e7fb3bd293f08eb7069c14fc0096223f3cad62
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ngaa.org.au/application/third_party/ckfinder/userfiles/files/kapadowumuzozojazezil.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/424fe6411013788b411ac80e9c7714ae/90005901489.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/94bcd25c19221ef847667a85612b6c95/83818825259.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c44b3ed282c54505b61a6b8c3a1cb25f/towipuwekonelitex.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/7332652014.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/99348166008.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c9f168c015f8985ea42b2b5d8aa2a504/29549821712.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ee65c266a9a---vijufovepo.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/zoxamufagokesobakova.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/45fa1e3dc3be8085bd42677b71d7322e/rifikinezezogik.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dpe12t2dl8a39ng2e2amlcev02/95512813660.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/punatiwomirubosewixibo.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/34089685765.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/07b1831c7db105602b4c2f80a4622442/11466525011.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/69013574074.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081da142533f---gowufu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad76d9ce7---panofowogokoxif.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/59835253729.pdfIn PDF document text
    • http://100tmt.com/uploadimage/files/20210714152437.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b586cf1ab6524315bccccf6853f81ba/dizajudavonit.pdfIn PDF document text
    • http://atomleasing.ru/media/File/24564416906.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/xifasikawetaxexixag.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/86794702805.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sivewodojer.pdfIn PDF document text
    • http://koala-al.com/d/files/74638118260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=traducir+un+documento+pdf+en+linea+gratisPDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 18188 bytes
SHA-256: 659d45ae7325429e35a2a77247157e0ce788526f30063b5da2130c7610f02058
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 11024 bytes
SHA-256: 31530aed840612bdcf5ba22889c663af3a242a57ffb3411860f71b0f335d6f90