Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb279fe9bfc883c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 04:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1c2097f50ef3aa70b8b57dce2621581 SHA-1: af7f02e0edc2a783b18cc396b194d6c17dcc33bc SHA-256: 0fb279fe9bfc883cbb82c4fa58d9536dac45df514664cc9b72873946864e697b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of `utm_term` parameters in some URLs further supports a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=algebra+test+year+9+pdf PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110dd5ba5074---55481093927.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/69044768974.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14b6d4bddc---96915183738.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/43145969359.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2avi66rr9rro1cag35lfaov6pb/63996937413.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f20c44fcba---tudatezogivosetekiduni.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7047e4ae---18626909673.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/donuruluzozoragetuji.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c92a8dffb4---26715693247.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/7747148234.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19cf025b71---34532615969.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7f88371c---mamezewa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0acaba69091504a4eb0ebc33dda25754/97313171982.pdfIn PDF document text
    • http://chinalabware.ru/d/files/lusup.pdfIn PDF document text
    • http://chayka-svg.ru/files/62507556031.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021060516228673987.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/webufebatufenuronisijid.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/nuwojutufigafoz.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/43912289539.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/bijale.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/39600gfh9s05gc6hniqummke83/tiwupivepotojar.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/giwagomuwovatatuboban.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/160958576.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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 15644 bytes
SHA-256: 66763b5f48b43d776a39fea856414d50a4882910a2499f26693940b049f1ae17
font_02_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10760 bytes
SHA-256: 28343d55a481c634ab44e14b35f3a7e5dda59cd5e766a0a4a905731451d4dfe6

Open this report in the interactive analyzer, or submit your own file for analysis.