Malicious PDF — malware analysis report

Static analysis result for SHA-256 c446ddfedfd92c5d…

MALICIOUS

PDF

74.6 KB Created: 2021-07-05 10:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ba32cb61e3dc46784023edc808f01e9c SHA-1: f5461da84d7838b7a16e2c4153dd37a665757338 SHA-256: c446ddfedfd92c5d187325bf705c92d6f05ad3eb56c2f04882dbebc439e567c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on compromised CMS upload storage. The numerous URLs extracted, many pointing to WordPress uploads, suggest an attempt to distribute malicious content or redirect users to phishing pages. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/soxuvene.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b8e984ac682d24f6b136bea299ac2f9f/zumonoj.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/36ihdgdlvpung73n508m0hclgk/20521962515.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fa83cd6d---vosuzixusuzadekiditezopu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/u6fr5cefn85kh5deo16im5d848/ferolinufujinisekoluwe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6c3423c1afc126c9f85a3678b39521e8/zitebidefexamagokimijezej.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076743fc81fe---mabuwunelakenijiwareru.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec690f0ee---29989307397.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2df45af276---22078291817.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/6952677412.pdfIn PDF document text
    • http://ned.ru/uploads/files/zakujufegimuvamen.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ke3f5i1a3n627u098ofphkdu17/23811907157.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210701025800.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/32978801185.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f226d185ff---79337162627.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafad0dd15---12965128951.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9fb46fc389372b7a1fbd233977e4e2a4/zasowezilo.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/junevawatobuxanos.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1f96166d---8015455903.pdfIn PDF document text
    • http://medica-brno.com/files/tuwosirurojotifupawuwa.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/xetejisuz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608855f305a16---62076528988.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/52121717296.pdfIn PDF document text
    • https://bataretak.com/img/files/file/75683897607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=keighley+to+castlefordPDF 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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16044 bytes
SHA-256: 258dd0cdca6a8578125773c04d14f59548b2b652aed05f0edc5bc19e3fb25d96
font_02_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 10756 bytes
SHA-256: 17c917115386d456c828900ed20ce7483a43a7b26a3786fd771a34f0e1222c56