Malicious PDF — malware analysis report

Static analysis result for SHA-256 634189b40797a040…

MALICIOUS

PDF

98.1 KB Created: 2021-06-30 23:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6bc7a59e4f8f7ad7b7eb91b34f42c9d SHA-1: 358734198e7641b064f29357a9c0d5a4bb3ce05d SHA-256: 634189b40797a0409e88a68cee8e8309fd89e613fb537d0b7a794d7d7f1feec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/j0j0hksvogfhhac21erirjmv20/wavubilosenulixe.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a491a2b41---bejadatutagumawofaxirodub.pdf
    • http://finemetal-cn.com/upload/files/bibewupofukunokujodanuj.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a1f8b63c6982620da8d7981669145f8a/makedaj.pdf
    • http://aprilboya.com/userfiles/file/29970777740.pdf
    • https://calmoinc.com/upload/editor/file/57011024058.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/liludemopivudovabob.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ba451c30---jiwavet.pdf
    • https://cafesca.org/ckfinder/userfiles/files/16692321624.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c45927f96---varefifenisudivarirakosi.pdf
    • http://kaupa.cz/userfiles/file/wisewuvojejutejasa.pdf
    • http://www.aadhar-interior.com/userfiles/file/21842640821.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921b6f99e82---82740656485.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8bc6a29da826da27c4f8ca99b15d9868/14222846716.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd03552ed---nivirudeki.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d459da94ed3350d2c9f06810483aad3b/7589627313.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03949cd4b8---13294576282.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/bf9cdfbb83f722bcd14d3c7eb11c6cc7/75793400297.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced3121ff7---12759684547.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5bdmjgf17hi6nv9e8m69fgnl85/xesen.pdf
    • https://angkalaris.com/contents//files/pizudegatedewisaril.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd7110b68---24016231206.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d99696217---bolumezeki.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0120246ec3---zoxezedopenukekepeguz.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/777b619e3ede3e8bcdfa7e8f07a0765d/wilaxuzibanudedinupek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hypnosis+for+pain
    • 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://ns.adobe.com/xap/1.0/rights/
    • 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_off00011de9.bin
c8efb06ef5aa36d8e3f4b8069aa95fc771c4ccce8dbbddb00333361f4858cb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 17712 bytes
font_01_sfnt_off00014c54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C54 16792 bytes
font_02_sfnt_off0001646b.bin
474746bf0bc09545327f856d1d02d56064c2f6ad9f54946aa130dfcef56403cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1646B 10180 bytes

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