Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd44ef75fcb2c32a…

MALICIOUS

PDF

88.0 KB Created: 2021-09-08 06:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37a5d06cedc6d1ffb2b17782f1ebe86f SHA-1: e76a7dad34f0231a45de3217947a1bf7b3b33c3e SHA-256: bd44ef75fcb2c32aa0185cf3712d271aa4f887898e014b64a8fbc8cd21219c07
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and the presence of multiple external URIs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://thinkglobalcompliance.com/ckfinder/userfiles/files/matafusaxetam.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca53ccc859---53835168127.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b420592d314---sirimobitupe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b0599799b17---zeloronezova.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/mawogunamolawolufisaw.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/deb6945a4cab5f977ffe0620882d12be/jobepaguxisiratenoluwiga.pdfIn PDF document text
    • http://eva.am/files/5d9c796c7e116c88.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3976d986---24096225843.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xanalakafomexa.pdfIn PDF document text
    • http://jucal.es/images/file/83133964823.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a570e5f42e---53192523639.pdfIn PDF document text
    • https://steammining.com/userfiles/file/10022867797.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/bazebew.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/lefefa.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099eddba9835---jalatasux.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3327da27d---92505467805.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/24689461908.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/56676759260.pdfIn PDF document text
    • https://eklyps.net/images/file/zosimuwakubibugekofetupi.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wubidevu.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/wuxeladovosulinanajus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=methodology+literature+review+pdfPDF 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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 18312 bytes
SHA-256: 161671933d00e56950a39e9129f8e7fee1a6cd9a582d5d250fb42d5e516cf147
font_01_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 10864 bytes
SHA-256: 486c526cdec352e30d65d4caf3ec831155f3f65671b7c44a9f0dae3243713903
font_02_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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