Malicious PDF — malware analysis report

Static analysis result for SHA-256 5481b9e9ae8da5e5…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 12:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7779950ec868aa359b4108a988f6a666 SHA-1: 92e2ca95ac4d073b31f9c2f6ca051fb1f3a24a81 SHA-256: 5481b9e9ae8da5e5f04bd5c115b67dfadb59c33b4df8560ce03d3f1cf1c98b65
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 sites or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=online+pdf+editor+reorder+pages PDF link annotation
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984e9926413---rakunesobomajesesipavi.pdfIn PDF document text
    • https://farstaslottsvik.nu/anvandarbilder/153/files/tonufutipokabibubok.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/tidevuxibijenovebimu.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/23196868658.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c941660b967e38e61540207c8b123786/72313367596.pdfIn PDF document text
    • http://texmet.pl/userimages/file/12777865310.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/kovasofepunovan.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/85487866079.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8sartq2c3m6q6bets1ugg4r758/lagurumujujame.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/99079913814.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f79142d8---65130375834.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/59944331484.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/32149293530.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608181334862275.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f46fe3df41ab697165abb81cb452e793/83742152719.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/dorufajojopawebuki.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/sozejatipagelavaxeb.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/befulafadukeja.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/gonezirogo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cbiqpd37c3ahi2i60d82h6quf9/41463851282.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b751258a3a---raxigexeja.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4a390f73aafe2495d15354ac496260de/dikopam.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210805081346.pdfIn PDF document text
    • http://sbairs.com/datas/files/zuxiduxumapixep.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_off0000b62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62F 15748 bytes
SHA-256: 6c80486aa0c08dede8b556d2d4badd83263fef8225ec88d2dac85ba21ba23fd9
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 10700 bytes
SHA-256: 4fab252ca3b8d821b5bd315d8002f2cf75354bb1a239434657148d55b4a9d50f
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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