Malicious PDF — malware analysis report

Static analysis result for SHA-256 97efbbf6c009de87…

MALICIOUS

PDF

110.3 KB Created: 2021-09-07 08:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f04801f1510d94a8895cbb0067e7a84 SHA-1: 95b42f64c2a6fcf28ad275828f86986a4c1d7aca SHA-256: 97efbbf6c009de872252a9feca58ff917e453ca22f012e0a0fa5e342d4da5e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sztarmedia.hu/_user/file/suvokurotubalopiraxugex.pdf In PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/56456800917.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607798f052e69---74099151252.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdbe72e35---ponobimuwizuj.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621670013.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/laxakutamafenivoduked.pdfIn PDF document text
    • https://zold-kommando.hu/files/bimujidusugagolaginebulit.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4aemobn7d5tpntss5n3575p9l0/libupilonugus.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/95307128824.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/kebomuzedunujosobofodele.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5h364q7es3tpp5375s5o6rc4d6/1705994951.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/81669832605.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d66aaaf34910e3e90d21f1935c807976/54238182084.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92abbc5dbb---rajokodowe.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kedomajemepukev.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/visuzajiwukigodebi.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/19228082758.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/pekujoravepigogijibenew.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/36130639436.pdfIn PDF document text
    • http://plncse.hu/php_data/file/38559515879.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108292051243399.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/famixabegapavumarukixov.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/72745859978.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/44746596594.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/fuvuxunurin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+language+planning+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_off00014bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16405 10652 bytes
SHA-256: 9933db4a9f3c75dcd7684da31eb28a9cf671d1b37489b031c0e32b99b3f54743
font_02_sfnt_off00017c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C17 18264 bytes
SHA-256: 54dfb70d6af74392a24bb19793afc958023c304762cf6772792d82a4d315d7d1

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