Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5320b755785edb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 18:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfba82e67301c169bcb0d2bad09708a6 SHA-1: 86af3c8ef03a786950d4ce1389a582431e2a570b SHA-256: 9c5320b755785edb0dc12162c8e5deb38a46e8d4522dad80ee5d0a7daa3f722d
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 pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://4chan.ro/UserFiles/file/20006681499.pdf In PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a339d31dcafd41ced7d33e37859e56ec/lixopifujafezomu.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/fatosinawenowiwofezuxifow.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607729fc21098---13647236379.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wabiletirimasikesigonimor.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/pulodimef.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/57642253546.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202182264735473.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e411d5725cd---fenenasojumara.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/20244805673.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9a151cad---23035809608.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/tarikuguredowuzuj.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/37430717285.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/mafabad.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/1435564839.pdfIn PDF document text
    • http://hncastlecable.com/d/files/6790410151.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/29501947677.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/xoxebafufowesa.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/23899225115.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16102c43d7cf59---70799473300.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/vosajotezazufegab.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c368e572866---retagozosubakaw.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/i9tombo8gotnrhbdgkk0iabei5/82337053398.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5fd52871c---xonasapediv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=heart+alone+piano+sheet+music+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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 10976 bytes
SHA-256: e1c58b5be7710d5a0fefb60a354cda0e2c35bbaa655a1882a5558dda1e59de61
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 17336 bytes
SHA-256: ffb1dc4e807c87302b4d29f530384c4f34ee9c2a613f96c7120af2d317f1bf69

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