Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb76e1e4fb3c9491…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 01:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27f00268bb57074d0ee36bc9a507a2d7 SHA-1: 3b7dc1669475ab3b1060ae7364861b74d611cc01 SHA-256: bb76e1e4fb3c9491cb7261dbe44977a7977141659db7611012b440548eaba97a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cructi.ru/uplcv?utm_term=wcc2+latest+version+everything+unlocked PDF link annotation
    • https://yourownadviser.com/ckfinder/userfiles/files/84183527394.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/71391807014.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/lajap.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/xarobato.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/86630186711.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613515837ed64---lexipewidokixapugine.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9899d3351---danitamovuriluxer.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/bevodisiboranekazu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/gurojitaliraditudesoveg.pdfIn PDF document text
    • http://machulski.com/public/file/bejafojarulopasozo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/44810568fed7032cf7da52fbe878f38a/67476990400.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/97643989989.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/rutavevanukaludegibapila.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/xujadebipen.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/35604647559.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/parijetimowofa.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219132051444260.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/88504762696.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/vatef.pdfIn PDF document text
    • http://btfa.tw/upload/files/23513766107.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1d3f30ac---naxumetusijazu.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/nusepuk.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/bixazasevexez.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/62421402490.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/41077591940.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc0055dc2---mirefiwulokepekezaxajon.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 18036 bytes
SHA-256: 95a7b963e8133fa9041b6559870feecd23b91b46849c7173e8137cde797395b6
font_01_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 11132 bytes
SHA-256: dcc609982e245b868db1d8a015d580daf5aa47a6d3cdf0a011b0274ba7bee9af