Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8b9531e73eebac…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 02:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bf26d808719a307dbb91a8ab4dd02ae SHA-1: 449204fdcd01d838eb2ce0f1c334f0453e3cbfa0 SHA-256: ef8b9531e73eebac10993b9422097729f99b12b6dd5c941e4b34e4287431f6d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving the purpose of a phishing lure or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://liqaa-lb.com/files/userfiles/files/luvigofilosoj.pdf In PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/81665421805.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/dokazexagatetexajasa.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/8949293379.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/34526588748.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/10403471231.pdfIn PDF document text
    • https://rafautama.com/uploads/file/zonenejojiw.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/31223226996.pdfIn PDF document text
    • http://candientuvibra.com/images/file/82232216918.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/tuxobexagobefotutudefu.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/8937081214.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/82c3f90390e2818f6f2a2c453324f5f5/26520875001.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/migupitenupokeruraxa.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kipenutavazotobupasa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332ddf7e592---80792315102.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gumegafafifenuseparopa.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/wakufixajowikuvorenatif.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9b8815cc4cbc7cfc5f431e31aae40e7e/31932601862.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/46842957490.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/042101548581.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/xoker.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/vepuzunodi.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/34361264241.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/95682070077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+android+launcher+appPDF 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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 18084 bytes
SHA-256: fa7910d4fb542f9817a1be23a18543f38dac59dd1a435b5b2b8f3bfaef57e05c
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 10764 bytes
SHA-256: 7ce730e4a630d2d390a0a4df5633315abbd97849eff162d1a279f5baa30d4d56

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