Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c9b2989d8f410d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 21:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: eee93778aef6d3ecb1748e338656b616 SHA-1: 78e2c49d3c359201be5bddc38380f8f5e116a9bf SHA-256: 46c9b2989d8f410d5e6fdd435d4f4c5edc43aa8ae8cc8561ab7aaf46a6a922da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ariaparvaz.com/basefile/ariaparvazcom/files/mipawewa.pdf In PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/1982438493.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/84763876162.pdfIn PDF document text
    • https://diphong.com/uploads/67661233206.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4bkraneot2hg2t4ob87dn6tkk7/levomex.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8ad85f157---kupejerijagevujuvesoro.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5re4rvvn25ljqdb3cmfptrq1no/fegakipubiselevubakoforev.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/7408235915.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xilekivabizufemuliporu.pdfIn PDF document text
    • https://tpk-m.ru/files/file/20225561177.pdfIn PDF document text
    • https://go2germany.ru/files/file/pawowux.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/26144699313.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/bevigebis.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///futovijedag.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/fegiboremopel.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/r8r50ih3teakikbeohoc9qfc60/38136965357.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/78400233479.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079882d04bc8---6480357757.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8540d013e9---61906510793.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/10225908090.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607064a043b76---saxavomesunes.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094164e4e242---latupomedobes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=healthy+food+worksheets+grade+1PDF 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_off0000bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 16588 bytes
SHA-256: 4074ced4b81b178c2830be77f5806a61bab8f5f49152843fdf2195c81784d0f6
font_01_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 10772 bytes
SHA-256: 44c76d77881b1210971bc36ea8cab038b4381dc6ddd48e8e81d7f5436928944f
font_02_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1