Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ed47a058ed3435…

MALICIOUS

PDF

91.6 KB Created: 2021-09-07 20:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7c844fd432b7f3a78838f4fbb0d21c5 SHA-1: f6a69e0053884ff2da0e70ecff661de116a31a90 SHA-256: f6ed47a058ed343547fe04cab2d328be9ecb1b35d2022b854258b32953483241
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly suggests a phishing attempt targeting financial information. Numerous embedded URLs point to compromised websites, likely serving as part of a link farm to distribute the malicious PDF or redirect victims to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://krisoc.ru/uplcv?utm_term=hdfc+life+guaranteed+savings+plan+pdf PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/baf0b91a1e960c3a57c9061ed74af12b/kirolonudebazilixirevoz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/68d3901b7fa9ad07f522adde8cf703a0/regutamajitobukag.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/laxokizuliginogab.pdfIn PDF document text
    • https://ultralloy.net/upload/files/wabigaboriga.pdfIn PDF document text
    • http://bptramptour.pl/files/file/modiled.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a840fe9fee---genajuvo.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/zogolad.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/davakugaz.pdfIn PDF document text
    • https://suksesunited.com/contents//files/migubebesonom.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/79194347444.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/v5vqorfamdo4h6l9k8tn97mu6c/kepexugaz.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa27bb7020---17716977889.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/44597533845.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b98313c053c---xaripavenim.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/janidedobexumalekifibuw.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/jejanufuvo.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kutewemaralujonivojor.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/zegipix.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da185e0c95f---zimunidagoli.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vufosoxafolupesoz.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/oqbud5vejh9vc77i7r7ue2h2h8/sugalomojezugavabimiwovu.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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 18460 bytes
SHA-256: faabfd785843c4dff9963a1070c506387e597bd42ab18d6aa0e599e5367d73f6
font_01_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 10832 bytes
SHA-256: 05c21d257050981e1a7736f9e90bf84cdf5a51a0fb78b9bcbc0a7da9a39bad8e
font_02_sfnt_off0001488b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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