Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a453e1f64591a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 04:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24e019d5dd95614cf889fc44cadb3d3e SHA-1: 7ebf55995dc8bee45faca4dc8c9c4044f01a8809 SHA-256: 5f9a453e1f64591a38a72ff46fcc4408e1bdd0cece2e5c91165cbbe2976e1926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a high number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the ultimate destination and leverage potentially untrusted infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://angkagenap.com/contents//files/9618093086.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f09267a357943815dcf03b924ad2a53f/lizemoradu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/124smegm3jsq4ju80620h1v6t4/63416499744.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee121361449---bapojosedazu.pdfIn PDF document text
    • https://777mto.org/contents/files/62665433771.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/12748560255.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/82735612531.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6032adf4---20058412326.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/julabixido.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/af825d014353ebfe24cae38cc646e089/jisufoxinujuzo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd333cc3e7---fepolaluvodizanan.pdfIn PDF document text
    • https://12tiga.com/contents//files/99366656470.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mapl5aon6l1g7e7hklji2vakqf/luradebulojesizogeveroxo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16106601ccd3e0---85218726730.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a0067a4b---24827080585.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/zuxasimasewiget.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/94297595056.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/65445136235.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/47573515752.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160814f965719b---tusutomirifude.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/bemapenijubomamirabuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=variateur+de+vitesse+siemens+pdfPDF 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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 18116 bytes
SHA-256: a715636377ba647d7d83ea5f2b9b0f356782e5fd65ef578c599f515f6bc4bcb5
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 10628 bytes
SHA-256: b4c5346f4d6eda588acf75bbdc9c357c550f529bb78748c6f913e31ff9b6306d

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