Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b4553c193f4a81…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 05:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82d67f33651bb1c64f2118966bf0780f SHA-1: b2580673e0d1eebe7efb604bee6063e688901e79 SHA-256: 97b4553c193f4a8195126d30e43ce107dbd838ee461331141a07d118ecb605cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=information+report+structure+year+6 PDF link annotation
    • https://habrit.tw/ckfinder/userfiles/files/mugirikukoxatapaxir.pdfIn PDF document text
    • http://torgradio.ru/new/files/file/gutobopofe.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/betewi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/retinamuf.pdfIn PDF document text
    • http://thegioioto.store/upload/files/4122427193.pdfIn PDF document text
    • https://ka-base.no/images_students/files/21760180572.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/sexaroxasululam.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/lejumubijot.pdfIn PDF document text
    • https://bagstyle.uz/images/file/lajalotosonivurabidex.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147a158dc4---jitosapulolozabeloxalejo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142196c06f86---47315203864.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/74957877340.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/63381336819.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/30113912422.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/54238038734.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/safimedurofudi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ot8fpbh66iegsp1k5sh74t0e3m/bepurupo.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zufekadonipam.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/telamawipuwasozokomas.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xawozujebelevi.pdfIn PDF document text
    • 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_off0000b740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB740 10928 bytes
SHA-256: 9ddbbd97ce18af6ecdb4e736237360d02286cf8518a0fca12689caadd7d8afe9
font_01_sfnt_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 16404 bytes
SHA-256: ec450ac9d1f8bf3a99f65d52f7e9f993c0ca0fde35cd731efa8ec18dea4b3f20
font_02_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1