Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca64cd895516e9e…

MALICIOUS

PDF

81.7 KB Created: 2021-08-11 05:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b60de029a81dfb968f28fe6ecdace451 SHA-1: 7dce8b0fb94b4627789e1b69a5605e1874507805 SHA-256: 7ca64cd895516e9ef284a52ef8ff4dbf84ed4427849497c4e802ad70fa9127b0
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and embedded URLs suggest it is part of a phishing campaign designed to lure users to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b23ae121---revil.pdf In PDF document text
    • https://rajakeempat.com/contents//files/37654532176.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/fikilamuzetenupopigu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kabakalugiziwem.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0c547f461af53bfb1c4dea8e133d3e69/newunad.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/jalinofim.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d8ca64767328e1473579bd3aa908d57a/kidukukubesoxox.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210517162946085.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094014679713---13722811503.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b1c19b54cdeb7237b02a2a4292b3204e/85001183609.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6b40ad98---nivukizajepivof.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021081003513673499.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/wuzebawegijaxerewefetob.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/rikof.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/84210581540.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ab98ea32---18629449487.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/70703757152.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/sumexedifisepepezuvi.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/57b083e69c75f3307e3f03de4abf24f1/majufigipumu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2o26j9551h5kubcvfu6i3mg7ko/88991774350.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/meragatekigemalidudeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=psg+kits+for+dls+2019PDF 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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 16964 bytes
SHA-256: c20e282a0b6a9b79152af2f30efbabe0120fc3e803fc160ec19cdf19ddb9da19
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 10684 bytes
SHA-256: e2a34b27cbb6647e1db27c903d4dd42d09dd997cf7a822f4e24cbc3440fd2b31

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