Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ce39dbe6047734…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 04:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a1fb283f3b224e810a22faf4c4218c7 SHA-1: 1442f5b674a7522561c505d9c337b03284216876 SHA-256: c8ce39dbe6047734c1985ad125cc599d52671649e197d0df0fc9f82b4e6e737c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that lead to external websites, many of which are hosted on compromised or disposable infrastructure. Heuristics indicate this is a link farm designed to direct users to potentially malicious content, consistent with phishing or malware distribution campaigns. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=what+colors+make+dark+orange PDF link annotation
    • http://bbu.vn/Images_upload/files/42479819534.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/tunorasu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/30982443895.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vigitigapebinegare.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/39751862576.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t34sonn50dmlm9nte05tqvgrfa/wijer.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/feluta.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/tafiziwubel.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/9485488512.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/77657771053.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/46812407551.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/96309843942.pdfIn PDF document text
    • http://citty.org/images/uploads/file/tebupirikujive.pdfIn PDF document text
    • https://conrays.ru/f/data/mabisu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/806c2950fb2fd20cacb5762fbfc22fdc/kewabajixewajabopip.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/dazurilinefavolulagavigu.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/doratumaninebunoj.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6aca83be508c93d844325aea3146343a/kixujabowel.pdfIn PDF document text
    • http://soc-in.com/data/media/files/rasotekano.pdfIn PDF document text
    • http://state-lithium.com/upload/files/64308510712.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143793e41753---8319843194.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/43833462188.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mh4qp8app4ufhcdp3kbdmhsb5j/99695352067.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10808 bytes
SHA-256: 9faf097c053dda34832f4b7f6c3d9bf4262822fff0dfa40e8e75d432b32da9ca
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 18636 bytes
SHA-256: d1d73b57921da169972facd4983d0f94ab550246d70e31534b3a0d233ed63ea9