Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83a4c090f4c4f4e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 13:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28e5f1ef6aab7e071e82abd28cd8fff2 SHA-1: 0e4d7c3eb68acf5411cdd414bab4075062a09723 SHA-256: e83a4c090f4c4f4e3c76d88ce600693d245d0e5b27be70e0682a56d0a5bc7063
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or domains designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://crysiq.ru/uplcv?utm_term=samsung+galaxy+ace+4+xda PDF link annotation
    • http://fc-junajted.com/upload/datoteke/kubolujubikafixamatol.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eefo01v13hsuci5a1t4ivfrgog/52085580446.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/71558099398.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98082032439.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/botalaxavuxagofisakelolu.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/35785136496.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e2a97bf06eebc5e56a01c6588e903cc8/jenamoduguligidoje.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/38622487771.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/56372803127.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/53477362592.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/ladigonujadewamef.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/gamal.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/m8a69r3gcv66n5innl3t5kkbf5/40662380847.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/6186290691.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e1c357e4c---votuxexumumafuvutape.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nobigigive.pdfIn PDF document text
    • https://duel.pl/userfiles/file/bovefexipiwokelijinati.pdfIn PDF document text
    • http://compsult.net/userfiles/file/dexokalutexolutulepinive.pdfIn PDF document text
    • http://szm.hu/userfiles/file/korek.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/73139219016.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/57757901102.pdfIn PDF document text
    • http://vladekoservis.ru/files/30331663573.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/pulex.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zisujo.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/57092133506.pdfIn PDF document text
    • http://haki.vn/uploads/files/15394345715.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_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10772 bytes
SHA-256: add72d835895da0ecb0ef71cf4d4032976c67e817272e56123bedb7301cbfd0e
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 17568 bytes
SHA-256: 4adee02328d529571c0a9aaf9e318f3bbc9f01f9386db2cd46b3813f815d7981
font_02_sfnt_off00012be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1