Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb51f8a1ea3e36f1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 20:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 139d73faaa1d1701d58fd4b6224ecc0a SHA-1: e85cf8e2df3884c12ae814807a35b298291eb250 SHA-256: cb51f8a1ea3e36f12691d28696356bee1fe7d9404e2bd6f1d68b21e2bc049aaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://profesa.net/userFilesfile/wevenuzefidulujeg.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2v1cf6au1pcmtlpbdipvbcgd2r/karazasarulebobom.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b85801b526a---71809255989.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/wekajugoleginavagatolif.pdfIn PDF document text
    • http://rhondachem.com/d/files/40327057448.pdfIn PDF document text
    • http://didopack.com/files/70324062825.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/govepeguluvorex.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/zaviluzekabixufozisi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pgcsoe24at4le5n5ktbtg8erus/danudemewuxizaw.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/sitijekojet.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/sefer.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f8674a572---56178038460.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/sosakuxewavosegafaku.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/negomakelifemojobugevefez.pdfIn PDF document text
    • http://imaginove.eu/data/Files/jizategulawobokijo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082efa29053a---16187427181.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/35954440592.pdfIn PDF document text
    • http://unseretochter.com/images/file/37565009666.pdfIn PDF document text
    • https://nistd.in/userfiles/file/11285364257.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ce79203ee47a3d36a06f9b9439c97a89/37969920077.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/buwukumezamabinax.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/fuzesapexip.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/bomaxod.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/64744582918.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/16320062438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=coleman+lantern+335+manualPDF 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_off0000bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 20704 bytes
SHA-256: 6bc923f9e54e1f146bf8ad6b16da8cba85275a1e3e4bc52fbb0755b8380638ef
font_01_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 10448 bytes
SHA-256: 9f7c3ede9e613836b4784ce1416242ede1ca1896fd9c01c26b73a8ddfd5096af
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1