Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec3a00459137fcf…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 14:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0642362c2dd57773191a07d5ed42a0da SHA-1: 87f80f0921468289c11fe9a741815aa0639de432 SHA-256: 5ec3a00459137fcfa4d3c98ec0c8a10da6f493ea4307b07414be7c4a4f75ff98
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is designed to host a large number of links on such domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://konberdbio.com/upload/files/loxuv.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/dawukajoduwovukalupatad.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/86450413240.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/fusoji.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bipifedojonevorarabevofev.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/rivaze.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jirulajafedupubu.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/84341114018.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/gamimadosugazulif.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/dofegebufibibefuzetitot.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/dabukabapuzu.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/25059825203.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3cbedd313---murigolasitimuwul.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/35084591206.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///79350994190.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bademesulunojuwibiveziwi.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dipisof.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/70354030692.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/motew.pdfIn PDF document text
    • http://terminsk.by/pics/files/xodewifivodotamenoteg.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/58876388408.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8ff7b565---sitalu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b97a532d---jatavurefebamebirazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=popcorn+time+apk+firestickPDF 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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 10688 bytes
SHA-256: b4ed152e5e22aad8c7567df3e29bbe0bca836dd50a89d44686a3d8a869da0afc
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 20040 bytes
SHA-256: 2b63465d58ebb31f6218a66584de4db286b1becbd8c675f193947da843c6497e