Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a730e155c1d59b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 13:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81f383d06143c605e70abf67af9be9e3 SHA-1: 0d7db1fbf7ade06da37af29b7df599d06a2c81f3 SHA-256: b8a730e155c1d59beb6b5df7c8394c5a3d48ab09dab4c8b7d66dc2df687dcded
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3e2777169fbedd7d7c990651f1d544fb/85208561983.pdf In PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/gapokabim.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210702_85ECD34A8BD93826.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/brkkioubh0ttfq7trps7gj56q7/kuputezexabofukuwiminu.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/tawodilifi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16094126753080---jitatefabazabo.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/gajop.pdfIn PDF document text
    • http://cuiquji.net/d/files/11192702775.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/72224964028.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079002b5f123---62162834318.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/89759074067.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/55481401210.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/tosegifotelepuwafuvoji.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9860e82214---34806151923.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607024fc19ec7---tusupujulirad.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/perovovuwuwofaw.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15552919327.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/linajositede.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/baxomozevaza.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/deniwefejemojegal.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df6b63f9d9---kolidifitujiwubixuf.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf3b684ee4---gejudumusabe.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2f9981f173a2951ace02c93a85acff71/fisuvefafat.pdfIn PDF document text
    • https://activepymes.com/pub/file/62620251994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=50+tons+de+cinza+2+livro+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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 11020 bytes
SHA-256: 3fb8f2dfaea19040ecb0a95959e6bb4291d81494feab0a580feab39255aac397
font_02_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 20056 bytes
SHA-256: bf79ba8e72f020b43d392ba06be3aae4fdc51b276e23b7b44c6936040b25132d

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