Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fab213aae36f8b…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 16:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b013b4b82b19a43bda62ebcc5c30c0c2 SHA-1: 39cd71f8d848dbb673685cedb17e3c9526b3290e SHA-256: c7fab213aae36f8b5d5873f53f12a9240374e851c8a5bbfef70f2855a0772763
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggests a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pwharrison.com/userfiles/file/19433876731.pdf In PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/96583098516.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gozubagemulisele.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eca122dee---4680847895.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/96922326516.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/70088464668.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/nexonasila.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/letofusolizewiwowa.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/76087941908.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///25703788459.pdfIn PDF document text
    • http://alpinashop.bg/files/5225942108.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/patakat.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/28650757515.pdfIn PDF document text
    • https://fejlesztes.codefon.hu/js/ckfinder/userfiles/files/menisuzozuvovisigus.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/62262750065.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/39039410905.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/55857507902.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/piwigon.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/dozetinobebodafikagan.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152dd1e5ce5a---bujonijefeviwuxokenaratil.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/popujosenevurol.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/42990224609.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161494509dd295---kowogurojidowifozida.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/78021920919.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/xezibolozezuvebaleki.pdfIn PDF document text
    • https://khanikango.in/file/nudirufabilarune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+draw+sonic+handsPDF 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_off0000b11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 10368 bytes
SHA-256: 991eac64559999d31f1719c57709d679ec7cf4ca834f61afeb76ff919d89b088
font_01_sfnt_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 16192 bytes
SHA-256: 367a8ea8aa692b27bb99d4a18a6c9eed052bca99d1ad2ae7134e046a6b7312ef
font_02_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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