Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68b35376224a5df…

MALICIOUS

PDF

178.8 KB Created: 2021-06-14 10:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a502458393b4b43450a11cdc1527383c SHA-1: 628c09a946ac363f127ee26faa0085548592c61c SHA-256: c68b35376224a5dfe3a40768fdc337657de8ac3dcb351958b242ed7271a222a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://oniceh.ru/uplcv?utm_term=ejercicios+de+ortografia+para+bachillerato+con+respuestas+pdf PDF link annotation
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160913c8cbf35b---63230904135.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ovm769ohnlm1jb04iksa1c69ag/82781050317.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609449092f14b---34523313309.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/govaxobixebenebevexejuf.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/47200b65e1621d0da1a37745d0bc0200/25426292392.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21afc9f7d449a6217aefe11194ffc341/gozenijexat.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e205ab4b5710f63f397a8daa286798a6/40972678867.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6d732f6555bc6dd4a60b947b30958908/73437778524.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b605cb2937e---2763510694.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/tiralisejaxumazonuku.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/mt6ji5nbr38qqq550sca0h5cgh/29595964025.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c332047f146---damezatusowafidaxixoku.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/vudufexelifa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7d87fbe94e094f307eddcd414b0701fd/zowawugavumigibobome.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3650b3c6199ba6d8f82b9376093b618b/25636283928.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vosaxofijedelemutiwur.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7c6c1581---denovobewezofajakojufuti.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/odpt6qpl2m6gbstjtuu2k95ia3/7437701058.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27272 1616 bytes
SHA-256: 24e5606d5c93f0ce848002d984df02d7a7f52b1a9bf4422a441b294114621947
font_01_sfnt_off00027a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A90 5592 bytes
SHA-256: b95dc320d6b7b5a33da23c6633ab01cad4feef4af24b700ab0e18a2fe32b32fe
font_02_sfnt_off00028d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D92 14168 bytes
SHA-256: d8f12c045574eef46dbe563063c064144da5befe74a19bfcdef9fa75db48a2c7

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