Malicious PDF — malware analysis report

Static analysis result for SHA-256 b019edb89c5129c1…

MALICIOUS

PDF

91.7 KB Created: 2021-08-10 08:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9898c4daa697663b4818558b5844cef SHA-1: 1bff9ff64b8270ce61ead37896179d580e856581 SHA-256: b019edb89c5129c1bdd5b5d661408fbc33c623497aa3d7feab55716fd1f7c9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised CMS uploads and disposable hosting sites. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=bridgerton+cast+are+they+dating PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0a78bbb2---serile.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/45607805594.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/vikoxozoxugaz.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/23309329054.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b232a3cc4---74200285966.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/xoguxati.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/zeweraxojedareferigima.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/78591369427.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/fotojakemubafox.pdfIn PDF document text
    • http://bdn10.cz/files/file/89866029449.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607316baafdfc---rururige.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zizomugof.pdfIn PDF document text
    • http://mesterek.net/tmp/17891893045.pdfIn PDF document text
    • http://axwelindia.com/uploads/jugizifefikom.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/06/202106282113576016.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/71b8dbdc4395d1f998b2ee4d4e9dc9e6/nixirojidej.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8ac2f6554f6eb27482d745fe4e11ce5f/lazisuxubekofifodile.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/gifeletezamopakusafeloze.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210713162310_9ptts0.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/ludivaritejajar.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079770c2c90c---95528609438.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210606061206471297.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a632b8534c2470d86f01a933157a424c/dejubemeduxunikatiro.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/67715933989.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_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 17600 bytes
SHA-256: 29ce95139004388f0a653b6f18a9e3120a8658592fd227e059d05d0dfc7bffe7
font_01_sfnt_off00012d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 10772 bytes
SHA-256: 2a1adb7181ba8e5e5d74063db349ad58b92aa6db147f03f09a91e1d39b42dae5
font_02_sfnt_off00014618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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