Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5989a5bf15aa86…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 11:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcc51a2b9a15105f133f9d3b3ba0c3ef SHA-1: 033cffe0af46894923c4d003c7b867740767c61e SHA-256: 7a5989a5bf15aa86d77e86879a1b6868fb7fe199c9d63640c27774177ef6d2e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e35e6591af3624a3d25c215ea2261bb8/98824706218.pdf In PDF document text
    • http://consulcongress.it/uploads/assets/file/mefirupuremujuxumubiluni.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ac7c72a9---busasobizegumotomitiwaw.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/82758039597.pdfIn PDF document text
    • https://diphong.com/uploads/sazarijujoroveroliv.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612598687156e---jaromef.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/telefulesuwoporemarefef.pdfIn PDF document text
    • http://drironcat.com/images/file/64306980653.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/pejimezasemudog.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/6426710310.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f267c8791505cdb8d2b94b954e4669b9/dubarezixukuxoru.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/89336267820.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/95029385602.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/gutokigojoxulajuker.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbc73545f0---6204283525.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/92036293330.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b366eadfd---93305051021.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/jisewemutetusomofi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dbb3be5c7ffbda81da24dc5dd750db7b/lurulepewevumepidu.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/50384418174.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073142e2a172---92276767779.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94312ea3f---sobumujemanumuziroziga.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210620151541.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/wipazetiwowamix.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/24633689966.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/bovepebotagosagugaluxa.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h7ilsttjrn1iddc8qgur79v2eu/gadaxuretagawezoxunepuva.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/fepuwosizofuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=employment+news+jan+2019+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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 17068 bytes
SHA-256: 7f0c675dea1a7c68ee33e55c13f7c95677f4497521bd931fdc64d06390b9a056
font_01_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 11240 bytes
SHA-256: 8dc8c6cad491f2e1bbe92275e72661f107f76910eb20e39ba580e0556ea6d84a