Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e288abb2f48773…

MALICIOUS

PDF

73.7 KB Created: 2021-10-06 22:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1acc735e7226e1ab955b2e3a82d78ce4 SHA-1: 7ce6acfaa7892c6337560a5b4a42d51d09d253b5 SHA-256: c3e288abb2f48773c190bc93b36ac367ac5c6b92f6f7568e3630758be65dd060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs point to a common tactic of using documents as bait for external resource access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=i+have+corrected+the+mistake PDF link annotation
    • https://xn--psg-9lac.hu/files/files/zizeg.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/turoxabuvalizi.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/37677117071.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/bidipurijexujok.pdfIn PDF document text
    • https://izr.fr/files/vozesisidisa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a5687e550d---lapil.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/pilunakumisejesewadadi.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/65000968945.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/lolosefoxuseguj.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/dezonizof.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/19888742985.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-10-6/20211006132907848175.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/43582482119.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/39028701839.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/ponavukumuzogufovuzeriv.pdfIn PDF document text
    • https://upaspor.com/resimler/files/82026323493.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/budepolivofitevo.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/vivekujilokupi.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/xubikafudirutasixuwig.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/zagiwivemajazotasetimafir.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7819992bc---batetim.pdfIn PDF document text
    • https://conrays.ru/f/data/52510298664.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d83cac0d65---nuradapa.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219271352471515.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_off0000bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 10596 bytes
SHA-256: 7cb17e473bf90e1021791a71663a684fa1f78dc1895731f230fa441da027aa76
font_02_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 17084 bytes
SHA-256: 0bd7cd7d45903bac74e49c99238fba750aeca14cdf6b9bed32f304b6314e22c0

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