Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab5591294ed6c78…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 21:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 332191e8226fb80d5f7e4670e7fa08dc SHA-1: bf4285b00436408406b345479fdc2bc0a8c2d6f3 SHA-256: 9ab5591294ed6c786702e8fd80c38a9d6d30f928b0d90a8429960d5bba242452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features link farms pointing to compromised WordPress upload storage and disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e6372fa1---59692581875.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a1680e94---20498082444.pdfIn PDF document text
    • http://skomi.ru/img/files/file/16495342756.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/nonoxarinawisunuvusepa.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/31643031738.pdfIn PDF document text
    • https://aashianarealty.com/file/nalemilimatofukepipezef.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/84167156997.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lopoxuvuxeloligobupesi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zifalukedojapanetafagexe.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/zebabenadibugu.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/67476370606.pdfIn PDF document text
    • https://capecoralliving.com/media/file/84019946675.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/jonubuparawewepolazi.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/kujudezinopa.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/dadolixegexe.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/70077020347.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/wozufaf.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/85086503799.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071551584a40---wexofututo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fizegiwig.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb69b4a8ce---95049415117.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/lubokubadusos.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/godel.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc70b6bf0fc---lininewaguxibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=research+methodology+report+writing+pdfPDF 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 11312 bytes
SHA-256: 081b6b5099ca0076470a5d04cb0f35539dc713c2695c9c40213ef850ba97bac9
font_01_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 16956 bytes
SHA-256: d48b7f586e592bad6c597688f6d304ce2d2c42502533d466a32daaa041c03c90
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1