Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34f45fe471c343d…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 02:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a519a1bc7fc46f0827fb94fac62c0e35 SHA-1: be39c1e20cb7b52bc25fddfbfa684887f1b50efd SHA-256: d34f45fe471c343d316a07818c6782d4cce163a214d159110be3977f5070a7a9
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing a fake browser update or extension. While no scripts were directly extracted, the PDF structure and embedded links point to a phishing or malware distribution scheme, likely involving the URLs found in the IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b38c8b0f1---50984905909.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1aa7cc17---boxesujibagepavadisiraji.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99d2376e7---78824334103.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/podafinekegunesusove.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4aa9af16d9edaeba82d9eae8dfa9a20d/zagonudenoru.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/nifotetejoromesowupoban.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fd59a14c30cbac321a0eea91bb2c924/41986910116.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d2879223cc30d1c8e54c0c150f24907/fifog.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f4f3a4f8d16051ec294ff6948effdbc1/lebawugamipovig.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/rilebelukujiriluwulugo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7fa1366ca7c4e000447a498eca90efa2/69973145316.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/38503405344.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/83794933426.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/p8pkv0k7scg839orerp7rs13al/sitozud.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/vijozabu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae672e5f42---25917215414.pdfIn PDF document text
    • https://latework.cz/soubory/zojojibo.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/podiwojirufazilipoxuna.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/kk0kj22lapbi1svsra1rerfo40/17548023467.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210616005229.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7c7ed1ef46dffd37bdac9183977ed895/zuniborumikosebeto.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051521052373499.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062423281641.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/4n7e2quqj570ubmv3asv2hu9n6/mobenafonijepizenaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=caraway+seeds+in+cookingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 10724 bytes
SHA-256: c07477f61302d7b6a68af60f4334414f510899229e6f924eb15be10459ae97cd
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 17932 bytes
SHA-256: 621e64cb3d68aab3bfd0f1bff07c9f57941954ec4125f4b48d4d792c3d5a95b0
font_02_sfnt_off0001380f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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