Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8d08bcddbd3817…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 01:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35980d1ce18203d01a40e64dc7d9296f SHA-1: 05ca92eb3545cb3830e905574008879986f4dbb0 SHA-256: 5f8d08bcddbd3817fdb5fef1c50a8d1fa007896fc6608b90f7895da83937a780
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://se-ty.ru/uploads/userfiles/file/petileforukipozunezuxeda.pdf In PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/sexoxabovukuderam.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16098b204128fd---jirazabumabovevunepu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/tozatuboxi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/96730897563.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/rosituzibupu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/reparupuzevikuj.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/87097337391.pdfIn PDF document text
    • http://waypl.pl/upload/File/32890103672.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/sigixorodewop.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/14907639239.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/23281268271.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34404abd74---zudikikupolusi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/52128423898.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wipifamivixunedesa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/39fl44krc0u7mparu40okepg39/90447206285.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/70388860944.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/71351391253.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/danifalusabu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a1ndhhblpkhdaedovqhrbjasoe/vomevovugamijaz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88ae8d934f---selapawake.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57c4332a---nawajotavim.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/murewoxosivorevex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=brayton+cycle+calculation+pdfPDF link annotation
    • 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_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 10712 bytes
SHA-256: fd8586e9b74bfea6bdbdeb4feb919d6dbb2853a21ae2635a579ebe1fe0f8dc88
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 18804 bytes
SHA-256: 607b1eb01fc9b118a2305310560459ff460dbebb4968543e752a3bf2c8a429d5

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