Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2e0bed1edbb77c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 20:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f1d9ab6c31310fe4b9670ff0456f9b1 SHA-1: 6dc7881a0499fa56b3df314f55e7ff7fc6af6b39 SHA-256: 5b2e0bed1edbb77c07b7197f517392f80fcf6111dd4302a1394f26bc605d596c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The file's structure and the presence of multiple external links point towards an attempt to redirect users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8poud9ae1t0rebqbq62pe31kok/sukewaduguwozanokobikulun.pdf In PDF document text
    • http://www.rpv-drachten.nl/files/file/mijudabirobaronuba.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a826a0afc---bepamororopisobudeb.pdfIn PDF document text
    • http://strahyi.ru/images/file/dunopefeselegiremoxobu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/48628042989.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/27illn1uahtrnrg0pgqfmsliqj/83613264444.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ff5c4c0a92e8865870961a31f3e0d620/jidaxosaxoruwafufo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea4858f70---13882108790.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c48977fc7---liveraxaboxurulidoje.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/68851534780.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/80080304927.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sogowoj.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db15ee6deb---pilexikomavezufegalusul.pdfIn PDF document text
    • https://eternalbliss.net/file/54293107327.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/majijuki.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077670214529---palorazodexefuxoposoguxu.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sipivoza.pdfIn PDF document text
    • https://wineart.online/userfiles/file/worofolutu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dasizovavarajuxixeloresu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3dbb85d1d---34978805796.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rh774vdfk4onh48vc37a6d0q60/vuneruwadupedoxusowazal.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/dowifazarijijaji.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/91740177207.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/99f01962a6bcfedcaab81e92ca5a13d6/zirijutezoje.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4ef4497c16a9a466f0d8b2f208b1c339/dosutoferobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fruits+pictures+worksheetsPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/74153017204.pdfIn PDF document text
    • 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 16936 bytes
SHA-256: a5e07b932983db0d50f800969da9ebc9095e86daf968aae164c1301ee86daf87
font_02_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 10412 bytes
SHA-256: 430af22acb7dccc1eb30bbd7e28849a8544fda9a900fdd087b8b903e2be0d626

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