Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4f52ef80c6f7bc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 10:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 116d62944bb25892c45a50f43a838299 SHA-1: c9128dda97bd667949eb62119f8e2a99743bf1b5 SHA-256: da4f52ef80c6f7bc5cb8d42790dfed9541aad8b8e836960ce06b853ec017d6c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://kapli74.ru/upload_picture/punewoso.pdf In PDF document text
    • https://makenie.com/upload/files/73688786741.pdfIn PDF document text
    • http://szpk.hu/_user/file/18258732331.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/binivepemefefur.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160731d33637c8---xokesiwotabuve.pdfIn PDF document text
    • http://lex.tj/img/file/faboragilekeriwatavaneg.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c535a6e51cff6513db854f47aff6d175/febojel.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/3235507873.pdfIn PDF document text
    • http://mfahk.com/upload/files/jamumuxitirabubug.pdfIn PDF document text
    • http://prograsifkalip.com/files/marivobuzelejeg.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800042f1261---nimogixuzovegadonibet.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/gixowujinesogawefelite.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5fd37f14c4f438b5c8810590e5ebc8cf/59875087778.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/xafuxenemoruvoliwoke.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/90187366770.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/desuxezifewobegaxu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5cb5be686d30974c8c1495ff67cd43cd/77557319986.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c0b356f85c52ca86da5c7bf002a12862/71226949052.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ed1c270fbb86617d2fbade34a2db5016/sabobadosogojomujozimi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/23271647468.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/dofideduz.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/kedabediriko.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8abe996f14---fazetifikozememurawebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=posterior+medical+termPDF 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_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 10428 bytes
SHA-256: f56d8608b13e1af2c9570b58d74e49d7ce2936b9a8ace8870d4ff3cb3d06aa2a
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 17864 bytes
SHA-256: d61072bc3e9b1ae09624eed7c13c5eff9ec014edb643175b55ea6892041fe6ee
font_02_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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