Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1cec6e8d08ce85…

MALICIOUS

PDF

80.8 KB Created: 2021-07-18 13:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c16fa61d096fce12d514a5fa13052b28 SHA-1: 0efc9a292dcafa7964f3972ab2c14f1386dff874 SHA-256: 7a1cec6e8d08ce85939305450f3782f5fb380989f8498a0304edbf5cae84d687
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or redirection campaign. The PDF structure and embedded URLs point towards an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a636a70b---65323184281.pdf In PDF document text
    • https://jordan.si/dokumenti/file/xebisimokiwikol.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/bovot.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/44338884400.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a857f0b99---51875090085.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fezetoja.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/1700200425.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/59795725480.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3e033454af8d0e3fbf39359b3a3311c6/98764849435.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fae245096---28416018434.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kig9aj3nbk4scrg2bn9fmggos4/31764293145.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b351d88a4ffd1d181b0658ce3f2ae506/86892677506.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/dobogiw.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b68605010c3---92851688259.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/buwenosifip.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/noxixedi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728abf1b93d---zedekujafodik.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xagilod.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/tukot.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bcf296f54---kubav.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/ligimadekeninozuxemakogiw.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ngpgh7qn2s6e57vkttih8k9e10/48206997417.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/dojakexizebubumuxonoj.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/figusiwuxirarufugeseda.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/34010293024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fr+blend+words+with+picturesPDF 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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 16816 bytes
SHA-256: 847f7f386184eb7cf369e713268fcacb8e47ebc5c170b45b749ac039d45a6ba4
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 10752 bytes
SHA-256: bf07736d1c8e5286040e726a38d4125b424833c8c607d09c3977a601f303f63e