Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3914ee62ae40fa…

MALICIOUS

PDF

81.8 KB Created: 2021-07-04 19:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f703c7be9d282161b20fa0ca86eba987 SHA-1: ef7ceff535c65f30ff9dfa31f99ad3664945a0c1 SHA-256: 3c3914ee62ae40fabbfce3b324f19af09adf726252f8e608c5703589ebfa618a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://nguyenthaotech.com/upload/files/tiporamanokukaledidemimog.pdf In PDF document text
    • http://coyada.com/up_images/up_images/94569116079.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c174c2e0533ad326f3ae325d29ace8fb/35600441734.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/9573795419.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1370fc3d6a---26807023641.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dab1ddf5c8a50ef08dae4b60ce4e82ed/rokolupenefumikibepux.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/54044065514.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/1538951304.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3rr2vvcb4i2ssmff38uauapo37/9767936104.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/dabexizinas.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f65949a66---52404115850.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6614ab2e5---96114092012.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b0d9a1bb38a2326ece4d5bcb1b82f2a2/wivexonepozuro.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/49380660284.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/lumujakepisarepe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ffba23b3---pawonurixojujasazezij.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/10150409381.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/67683358745.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/sowobugozuwinufezowewim.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f2e9471335ca69f1dcd419e44cdeeec0/fotunozesebufe.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/57192479925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=craft+out+of+waste+materialPDF 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_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 16912 bytes
SHA-256: db73de51d965fe20a3f4c2c09b6a730e51bd5a69e69011110ab7a74936614b4a
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 10488 bytes
SHA-256: 26395786ee425eba16538a8c1029501b89cdcc5ecf6c16998831cec05649c20a