Malicious PDF — malware analysis report

Static analysis result for SHA-256 53505dba76894a2d…

MALICIOUS

PDF

76.5 KB Created: 2021-08-31 16:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac994c547f68139fad4e84a43bbdcad5 SHA-1: 1f46bc33615c49ee87b0ba0c560fda54295c628f SHA-256: 53505dba76894a2d65e7df8819c85dba1c6150afec4987accc88eadb5f14186a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's used for phishing or to redirect users to a malicious download site. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly suggest it's delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/086a4066d4f3b1a0d74b9749421fe0ab/kelibusevogomilolubu.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/85762f4491dfa8ee248e2a5b519f06f1/45992169525.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/87192216653.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mobagexizevikezuwuxasoxit.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160871908dc054---tosabagufulipipaku.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/nipagero.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53020204948.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/28560047035.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b88fd25ac7014da2f4313a065e2c584b/19192360544.pdfIn PDF document text
    • http://cabini.it/userfiles/files/kegemawumazinofekixu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b91e5cc38---69292895302.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/muquajeaigtb8ksrklb47rvb1r/xunakexoxu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/77997147831.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0fdd508c1f9ae81abca27c07a025c79e/72225924957.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/284468815.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c20abb98---38017380070.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/godujuxur.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1959489111---83896285411.pdfIn PDF document text
    • http://tw-go.org/files/vajufawifakisikisir.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kedumupuw.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2dc86fe66cd197081959a4b58018f609/42397130823.pdfIn PDF document text
    • http://zerosquareonline.com/file/61629824526.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/xinamozuzalud.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jelixorodofim.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/40809089729.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/03f42133e2d49625cac2141a22e1fdc2/80435535670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=to+be+pridefulPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bafozerugutulevukawubitu.pdfIn PDF document text
    • 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_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10160 bytes
SHA-256: 26ecd15126a850f167f879db52584180332d2b5612a8d87029da8da83aaae621
font_02_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 16948 bytes
SHA-256: a2a0ece642343e436e6665bd410b63cf811e1abf310444ab85affa42107d3c07

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