Malicious PDF — malware analysis report

Static analysis result for SHA-256 616dafe6799a1cb2…

MALICIOUS

PDF

103.9 KB Created: 2021-09-01 06:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c16dd25763d165ceebc85882136e4aa2 SHA-1: 72a8d584e8f4bbd0a42b4b2a407898f65e5cb2fe SHA-256: 616dafe6799a1cb27fabe04a6d8972edd65590d341ac0207c0420c4a3e8bbf75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://laborke.ru/uplcv?utm_term=conservative+candidates+2020 PDF link annotation
    • http://thongthien.vn/upload/files/dujozivimiwevodoge.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2481819fb7c495ca35752b8f1db0b64f/90731353471.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3cb9bd3b67b98773a59c5b41b0105737/30070555841.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6571080d80f61def1dffe4639975e682/fonawewawujiselumoga.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098d423751f9---29227479260.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210703_BEADBF58AE82D3F5.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b801eee5502---32055915887.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021716151122774.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/96347e14922994563c7a379ca74cf5e0/zigufowaxigulukur.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/fafufa.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/69426639083.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097cbd13441d---zowesetobatuti.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4710b3f4a---bokiwap.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nodunudizogovufigapek.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/visuzulaxojopaxedibamo.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/nevulitobepukolitaj.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/64462820354.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/vepireramexurenu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/19334142dae3bed3470e102edebf78eb/37959882229.pdfIn PDF document text
    • https://mszukam.pl/dat//file/21838701211.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/viguvukusefatomegavazoxak.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/gizitasigibanip.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/4807764622.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_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 10656 bytes
SHA-256: bdeb080c1f4dc74552f8e2ef607f0349a68b58f8cd0b4ecdc5ee4a7509dad635
font_01_sfnt_off00014a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 18132 bytes
SHA-256: 17b23cfa0b9864773e7ccba07b9a3d457d9100e3005969f2ca5357de0e2f9070
font_02_sfnt_off000179b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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