Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9b0f70beeff1d5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 15:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a770d7d8ecdd29d081bad1f4ac8f841e SHA-1: a05321919f92142f2078f0f61720bb8ef83e95a2 SHA-256: 9c9b0f70beeff1d5faba54a802e1149fbe9172fac7f0f9cb2dbe7524e8704f5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to potentially compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://nucamsa.es/userfiles/files/37180182479.pdf In PDF document text
    • http://instit.ac/ckfinder/userfiles/files/buvobokulab.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/79248477169.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/73208950992.pdfIn PDF document text
    • http://xprchemical.com/upload/files/sepaxezolozufegad.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161391e66e26f4---94115706803.pdfIn PDF document text
    • http://babamoleskine.com/files/file/53448021377.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c034e826---16193463923.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/rufudiveduve.pdfIn PDF document text
    • https://latework.cz/soubory/67504750762.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210902182558887409neacwv.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/4888903378.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/67604083741.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/4957869722.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/65934757617.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/vabirubunofutitus.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/popasewozoj.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/20284418463.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/92b4fea20896df6a8948ef4bf8e4ede6/43918509546.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/57016275435.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/71145708170.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/tizagisapewemim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ppsspp+iso+romsPDF 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_off0000c1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EE 9872 bytes
SHA-256: e0fdc937e168f52a923c2371404201fba59333a23f02df4450b961efb3f8d18a
font_01_sfnt_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16996 bytes
SHA-256: 6bc77e0f4cd54fa4d85349156ba2de5356c9447289b1f101b12f7f0b39a6b085