Malicious PDF — malware analysis report

Static analysis result for SHA-256 510067554f28fc8c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 20:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6209e1d347899fdccf57c5abd0cb927 SHA-1: 5fc705413b1ed5401d5d781ddf3ff9ebf4bfb47a SHA-256: 510067554f28fc8cb76324906f087b3fa1c296fb0711004a6e0bd26a7fca7cac
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised WordPress sites or disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://anfauglir.com/images/file/kakamore.pdf In PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/zudinebudadedopazaliwo.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076afcad1c19---peforuwufokoz.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8u73hp47nf4mt3rk004mdd7f7l/2616455552.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/42548307197.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67180747656.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607507f7bf3d6---rupovaju.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16126e5db4eb73---tiwunatigenixarurataluw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8334a4eca12f01163bd64822ca396aab/nasogurenigobegaxumagola.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/nufaxudubof.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d283d242b5---47453989464.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210816071755.pdfIn PDF document text
    • http://zuche0551.com/upload/file/difazuwujax.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e569d039ba6e4b97a91fc3c57402280f/3210758316.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f70dab5c52f---tibebiremijidi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/46054915052.pdfIn PDF document text
    • https://artbynela.com/uploads/file/42340496199.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/23845504645.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/logixoworuwufejenadig.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/notigezuzokuxovadibed.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/kirilizumabaxubo.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/85725893256.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/79384887301.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767e6519ad0---82414184570.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mg69n8jglb4jtu1c1tipm29c42/6045932551.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/dipegawenefufizagirotizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=logitech+g933+artemis+spectrum+wireless+manualPDF 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_off0000bec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 11304 bytes
SHA-256: 506dac51accf27a5b63e767a40bef84b3650e9b9e790c38036b8bcde8f13ff71
font_02_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 17540 bytes
SHA-256: 525f34c18baf6d170ab2b5321e593953bc96251d24057c6a3f3758c97c08fd7b