Malicious PDF — malware analysis report

Static analysis result for SHA-256 57453bbc714398d0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 00:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3f03d50f49e38692eb858a970cc33cd SHA-1: 9a9954b9951095b06f627f217f72e40eee22d734 SHA-256: 57453bbc714398d0b124c83dd904a1439ed32cf4974216bc1a3eea364efae007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the links and the 'link farm' heuristic imply an attempt to redirect users to malicious content.

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://10playsolutions.com/clients/softklk/documents/_articles_/file/30850243951.pdf In PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/523285252.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/77286220004.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b9f4573e---zizagulitawi.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sabosalinexujenobawapo.pdfIn PDF document text
    • http://hongdacable.com/d/files/70725501253.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pokusa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c5eb14e1---14405608415.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/dosibiwegebatozomusini.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/bijetorexatilefig.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/buzevetanawevusavip.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8a08551b---pofofopikunagoruwumek.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507e1aab84---dovof.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tewawiwadoba.pdfIn PDF document text
    • https://armenia4d.com/contents/files/14857048057.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/nubaloruzenoxik.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/givepuvekusidowunawire.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/dozisekozov.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/86387796790.pdfIn PDF document text
    • http://hodori247.com/uploads/files/kubikebudodovogoxiv.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/36244152705.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/zefolumibopufo.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8735759523.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/45806132170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+location+accuracyPDF 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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10260 bytes
SHA-256: 40cad26b4e9121daf273d7c09c4f7ccc54813e93b6fc2a53cd7fc7c1a2dd4b59
font_02_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 18128 bytes
SHA-256: b5c7c37e5478722ea0877dc2a7b61cf9ef3145302f76ebb428eed4f176adbc05

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