Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7bfe500eb9a18a…

MALICIOUS

PDF

94.4 KB Created: 2021-08-14 11:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d807f6d71f7a5f735eb8df3710fb917 SHA-1: b6a6aae4fbf45d73cfff3a29452bfb9308910a44 SHA-256: 6a7bfe500eb9a18a37d20bd217471df217ca458a8f7a5dd346fd039db7f93d45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bbikn2qm5cv9b40dtmm3fdpsbs/72063926548.pdf In PDF document text
    • http://mayjack.com/upload/files/vozoguxejuso.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e55d93647---pamuxokalufapidinido.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/05b9da89b4aa86909d0b3922bf06c0c6/lipobabak.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/vemejoripobinosametegimol.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/srqm9ocplrrao54vl4ft6fjkt2/27068113130.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbaff555512e2a1d3ab6f9080fa1cbb6/robusenowaxulujuv.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/4891861834.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/kuwivowil.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/xeviwevabudexijod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/41257730219.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094547ed08bc---wujukasudupawiwetuvagu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb825b664---76208091393.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d54e4054d---80493757199.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/52593122429.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pd91neu1c2et3ku8vbvqqkk4q2/18100902636.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/afb9712676475e28bdde37d5d6c94d8a/fojudosamitifafifoxag.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608736f90f099---77107990255.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ad9d65de---xuzatu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/kdeeku29kmv0eg60pqld76ion1/bojenamo.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/15479399401.pdfIn PDF document text
    • http://446888.top/userfiles/file/33614972648.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1317e54ab480998659c6f990755878d7/74091034063.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161e86e9d4---wezusenexu.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/14318621706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bvms+9+release+notePDF 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_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10464 bytes
SHA-256: 1c6ad640f989225fa097c06fa23968ef489b809637eb9d13a374c331fb8b4c95
font_01_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 17376 bytes
SHA-256: 6d9c5db52e8c5a00deb996282a1fa81e4688e244483815772d00cb47993d11d4
font_02_sfnt_off00015276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1