Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72a777cc4579cc4…

MALICIOUS

PDF

90.9 KB Created: 2021-09-02 19:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97c955282c71ce356b0a4819d23d5938 SHA-1: ba369f16bd032345f8447a5aa44b03b89b78c65e SHA-256: b72a777cc4579cc4efd2dd5152da9f42aba595eefbca095eeed98b62b6fc2ac2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://makesomenoise.hu/upload/file/felotomixo.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e4d258974---55112372771.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/77667763330.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/gogipokufabawosabopurapot.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/45852984972.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/61967049009.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/94782051071.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/17850083796.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/92682476115.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/82158530644.pdfIn PDF document text
    • http://lagrupacio.cat/file/26302523020.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/2fd13gm84gqr162f6s0v88gn10/36953849718.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108311316461913.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a9ec6ef15---23644897198.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/95589419747.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/rebadik.pdfIn PDF document text
    • http://fxmeat.com/upload/file/bda3516394667dd2fe5135492129588a.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/nuluzijejowemefesaxi.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/4718707047.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/sazavunuvajokoxafekuxe.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/vesuremo.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/vasoxelobabijowiruximo.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210619/file/11041472972.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/9humvrvv9ku7ico89ihae923h9/28775465823.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9677a19e---pubonuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manual+de+caligrafia+y+diplomatica+unedPDF link annotation
    • 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_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 11000 bytes
SHA-256: 27aa317295a0225e0230ff4031ca8b1a4f0383470d9742cf82470494bb13c163
font_01_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 20596 bytes
SHA-256: cceb1f545fc648c095d8620dbb5b29ded147bfbf45833fa56c429717986b4f15

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