Malicious PDF — malware analysis report

Static analysis result for SHA-256 e548425245b6e7ef…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 03:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 122451c7b5942a745c1d4c4e17b39282 SHA-1: 1c4291e6c7434fae3a05fd04e426244af5dba835 SHA-256: e548425245b6e7efa68a40afb7d4734af074308d4971908199ee238a4f99ca78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to manipulate search engine results, likely to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=fernando+aramburu+libros+pdf PDF link annotation
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610afd5a135a9---86712884995.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/33910721818.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2e0f06b39---jaxapikor.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1a15d3ff---22937383762.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609488679ea35---legemutupo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a23562f25---8508297115.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bawakodumopudinoruwanijad.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d51af050---78589245694.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5332180b5---fagorawetojipufojimupef.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/xemoxuta.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/gezekexugomunizidimogume.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/46272142687.pdfIn PDF document text
    • http://abnicum.com/files/file/jozudorovitogo.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/patobozizolo.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021081416289172325.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/md0tf5425vc7l96v90ira414vv/lixobit.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zokorisivojanukuxodus.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f527e4f3b---mirola.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/wupebanumitedumevab.pdfIn PDF document text
    • https://renault-service.com/userfiles/fituke.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608011f1b7eac---10104916683.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/88420690802.pdfIn PDF document text
    • https://drsaman.com/files/kabominumaxukipo.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/b1e7798d78243533197ff713067c3e63/nefudexe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797bddf0f1c---25790353669.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cefc3987f423ca14101aa85f5df4d3ef/69637952430.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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 18648 bytes
SHA-256: 1c85b1ee4db98d2c533d9c03554f3c62581ca373d144f5d7ee3c6b7605778c9a
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10776 bytes
SHA-256: aa0fb3704bf699dbcea6edd6e0aa9a67043d6ad6c6dd9283c2ada0bc7d269004
font_02_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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