Malicious PDF — malware analysis report

Static analysis result for SHA-256 e017ecc85d679993…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 11:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4a8d6f5acd7b6d7d5f0a1c6d6f8f4699 SHA-1: e5cea8c5eee5d76caa1f6165cbd2668cbd6e301f SHA-256: e017ecc85d679993b2e77d340447e55f26c067d2d778ee0cef8700ac17f37c8d
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised CMS uploads, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161325497631bb---3568811427.pdf In PDF document text
    • http://finalbrand.cz/upload/file/47928479943.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/47163133565.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/88605784831.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-8/20210908053605265218.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/11449075699.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/83870859431.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/numusukinitodefiku.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/26371519097.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/vepava.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/80689171829.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614501d8145ac---tobizezixub.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132443ea7711---pubuwe.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/funuxuwiveligotonurukev.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/5flrqvr9quc29jjdg62tb6e46g/sixamevi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/35806649159.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/riwadibadejasaweforenori.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80078195098.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/kuzezudetazegusewo.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/84028957680.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/45193079874.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/29767784952.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kajapekoter.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b438e7880f20297820b003cc02a69b89/fijajasewafefivupisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kimetsu+no+yaiba+movie+free+onlinePDF 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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 16876 bytes
SHA-256: cafa1396a4b5b6b3d35e7aad6aa93607f5fe772a880edb9d6d371dc47a910471
font_02_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 10788 bytes
SHA-256: 931f65354ba7c0b766fc199016021b8b639764ca2c6b61bbe0f599dc87e5ee0d