Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e28b9a83b972f6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 23:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55135fb26c9b56ffa0ef9eb7f69c0bba SHA-1: 90f81a8cb31b293cbb1065498023174c4b7f4226 SHA-256: 31e28b9a83b972f60c4bb1e01084951f4406f1a75bad5413a41304accfbb92f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://crysiq.ru/uplcv?utm_term=star+wars+rebels+recon+missions+download
    • http://autoscuolavalerio.it/userfiles/files/77106469310.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/84278626164.pdf
    • http://88cpap.com/userfiles/files/16178233420.pdf
    • http://seoulsquare.com/userfiles/file/beferedizekowafepi.pdf
    • http://pospatrans.cz/UserFiles/File/lodafiwitudopopagib.pdf
    • http://benetalent.com/upload/files/18656312301.pdf
    • https://semut73.com/contents/files/99423538159.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac5a11d667e168ce62f446ddeb03606b/19445232396.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a82f8562a---34433110486.pdf
    • https://tkquiz.com/userfiles/file/92744256013.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/kevironeginomamapijule.pdf
    • https://terracell.pt/images/file/63356608307.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/sujimifizipoxorulokuwow.pdf
    • http://svb-volleyball.de/userfiles/file/nirupimibe.pdf
    • http://kientrucphatloc.com/upload/files/wivafufemezelojekelabofiv.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de9e7e0f42---23706421485.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/rubusen.pdf
    • http://abogarestudio.com/userfiles/file/fexiwu.pdf
    • http://tiwtactic.com/userfiles/files/zezotelugemow.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/59066942462.pdf
    • http://farmaciafoglia.eu/userfiles/files/nawupizekata.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/17997192565.pdf
    • http://csc0898.com/userfiles/file/20210916012910_ao6yvx.pdf
    • https://vieclamday.com/userfiles/file/32429073776.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 16792 bytes
font_01_sfnt_off0000ca15.bin
b5b380c9dad3e1b31c79d1ca3c8b86b9e96f69137fa1d3db9c557d16f880267e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 14948 bytes
font_02_sfnt_off0000efda.bin
617dc2a187636bf4289df25738d86adce855d9ce91a339975cb1c517891bad53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 10832 bytes

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