Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d298cf1f8c7d0aa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 11:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 735f574e476dc7379ad369a037138298 SHA-1: 2f53fc029426d3e2a5e25969dc358ee87fa0ad68 SHA-256: 2d298cf1f8c7d0aa67e2cd4262b149765c6164f716811e6c4bbfa61f22a3210c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the heuristic firings and URL analysis point to a pattern of using compromised sites to host or link to further malicious documents.

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://ncfc.com.tr/ckfinder/userfiles/files/wiwesexir.pdf In PDF document text
    • http://tysons-cafe.com/uploads/files/jetabigo.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tirifime.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed53d344e---derafotopededizexiza.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/58596364611.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/56924381044.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/11928244788.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e0c3aae3---80687135247.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/kurakadaba.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/60576847956.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/49755625114.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/25e5c5dbcd286eca16331a6fe6ee50fd/jexew.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/51132638098.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/28606213600.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/vaviseg.pdfIn PDF document text
    • https://qkon.ca/images/file/gesizu.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/61406331707.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/8875074756.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/9492781114.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/17153109010.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/fiwifazudubov.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/62389769150.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/namoxofaripesera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=subway+surfers+pc+modPDF 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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10956 bytes
SHA-256: a79aec58de48a01c25042f7b5da3d5a50660c9299626171cfda069365f1048f6
font_01_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 16836 bytes
SHA-256: 61538b428bdce2cd64337659da457456c80f11040648e1542094e3cdd047a61e