Malicious PDF — malware analysis report

Static analysis result for SHA-256 d629cff6ca4bcd93…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 17:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 510c07f543d3d4d51e5b2becfa628e59 SHA-1: 54b5cd19a454e84217a3982830ed0dfd2b738f04 SHA-256: d629cff6ca4bcd9391f05ebecd2878cabf912d71cc9a047984a073155bb16995
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1246a93e1---86812749518.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4aa156aca---16600953925.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9296fe3a---gigubibekigefibaxuweru.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/26037675388.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb98662af---41839261637.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/mafisinufewed.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/78530845966.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cea01a4f985---13247629971.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/13770922615.pdfIn PDF document text
    • https://patc.fr/imagesfile/losesamibif.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098743ab7adb---piteveravarewevifeveku.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a784cb045c6---85275159728.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3067269e177455a16b1266f91326832d/nibepovepidibibuwave.pdfIn PDF document text
    • http://51www.org/uploadfile/file/1c535fa98c24e724d0fbcf4e291ed08d.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/mafonu.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/19001020631.pdfIn PDF document text
    • http://fedoro.ru/upload/file/zitulavakapup.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8m0fimoc3ot77dttum52rp28l2/gadotodogitarowo.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6u3m6ksmsd7ra26gud6s6fti6/50866494119.pdfIn PDF document text
    • https://puppometalli.eu/file/62140746550.pdfIn PDF document text
    • https://xistenze.com/files/files/47107329773.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf0241a55c---berixenuvemapedetugota.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/safugovefebufusinilabubuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dipropyl+acetylenedicarboxylate+msdsPDF 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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 11032 bytes
SHA-256: 710ab546ace02e61ecebe5520add9f41cd3dff2f9b20cf0665c11384b9ef8d38
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 18656 bytes
SHA-256: 0cd94441c560feca7a658642f9bae49c3a2cd891116722395c2b4f295ea306c1
font_02_sfnt_off0001360f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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