Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ad2ed39d14761…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 17:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02218b2a0cd7569ef8fb8e3daf5a738d SHA-1: b36c2a1f9cf01792af270eb161c55c1c85d8de01 SHA-256: a47ad2ed39d14761db1d59e25ec00355e5b29c8960c9373a322f85bd42cdee07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+chuy%E1%BB%83n+pdf+th%C3%A0nh+jpg PDF link annotation
    • https://acgroupenterprise.com/userfiles/file/28562654673.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/67339475892.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ca7783ad---53772679303.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160776404cd801---91372515788.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/44926978150.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1b99ac11---72774738966.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/biminotuzelozobupixovigu.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/67323831160.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/19060327584.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a7fcc49a1---81479188139.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/nituronojafuf.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-28/20210828035643929886.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbac986a3a---11884192998.pdfIn PDF document text
    • http://regcureguide.com/files/files/7461603599.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/37843685408.pdfIn PDF document text
    • http://midel.me/userfiles/file/78997369707.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/darawul.pdfIn PDF document text
    • http://p-energo.ru/content/file/4455357664.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/tdnmnvripksm31luno291aqa9v/jilufog.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/85127171761.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/gidaregejuzaga.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 24780 bytes
SHA-256: 8495686c3bf3e03a9dfa110efebbd69970679aae9ddf23ceed13306789cbaf43
font_02_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 11400 bytes
SHA-256: c308f0e0b0fa69fe12e96b4f7e0bc04c6362cc691987e13945b515fd8a0b8bc9
font_03_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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