Malicious PDF — malware analysis report

Static analysis result for SHA-256 b592c5303e71a4be…

MALICIOUS

PDF

227.5 KB Created: 2021-06-22 19:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f6ad9b919b18d2775703dd192283cc09 SHA-1: a1e33cc7a58e31c1b8b3dfb423c6a5e9bf1df669 SHA-256: b592c5303e71a4becf6fc16426c0d4405ac886dc1f4afc9807e430eed454d7d6
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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=read+the+lion+the+witch+and+the+wardrobe+online+free PDF link annotation
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608567cacfce2---33536066550.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/d36auv0rresg1f0sf0tju27c5q/wejerefobatedujalajibuzaz.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/ligefap.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b4ffb1a333c90e35f4792828943feaf8/sokujonop.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9684f7a0---zizasopufuxanet.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1327ccb799---66473637185.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/3qkjojndr63rfa17cvobddv9j2/84266090600.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/26710681409.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c825404d038cbfd5b31915062d40c9d7/xopakesegodafe.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c1rant23aspbs3kt4getjsgikr/50419098867.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74472b0d8---50755738048.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/v1j33jf0dq8fim6ssr5ijegbe3/xadejutidikogilu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad242057150---wunajelatawudawideziluz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3488F 5168 bytes
SHA-256: 14931496fd52c8e7a72d763733ee60ed3cc15d59b10f61849365c3ec316e0d22
font_01_sfnt_off00035a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A37 11204 bytes
SHA-256: 04305bba2341dba76cb1446380f5c12e1f83170ede433122645862b0ade75582

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