Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eab4a8a84aa8fd…

MALICIOUS

PDF

91.4 KB Created: 2021-08-26 13:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74d4fac9227982e245234ad188815e67 SHA-1: b7ca0a31de326a8ed1213bc05714a6e2295339a7 SHA-256: 53eab4a8a84aa8fd865fb9be070e0edf3fa68a49205ce91acab44b5cfc550a28
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The presence of numerous embedded URLs, many hosted on potentially compromised sites, further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a0c68003---45672902797.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcc1ea079---selebab.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5558f38d---32607613494.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tunedikewovaditekanubow.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-16/20210716051503435920.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c871a8a1d86---26702017047.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/6442052325.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/bipujitanipegixo.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/53834307345.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/40983471825.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/jerap.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/gasalazida.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/zodatofazamesirupi.pdfIn PDF document text
    • http://turnyras.lt/Files/file/munogofuxafukanetumodiba.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/2810745218.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/kigewujogotixedijawas.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/71328951144.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837775efa2b---vimadonemitirurixejuso.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7ntv335hv8m9cei0pn5hp3i8l8/morijexemakoxebolomame.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0172a109f---jiminexesidetub.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d5668bed3---87298194606.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/33939858354.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/81cc5acf01ef3352f53a59638af7c91d/41276200981.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/vewuwokaledexuzijozasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=congratulations+best+wishesPDF 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_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 10744 bytes
SHA-256: 3612acbbb3ca848dc727b5708f92050c7d87c9afc2da98da0678ca050f823485
font_01_sfnt_off0001179b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179B 17756 bytes
SHA-256: 340f6c762fde4934c17657796657493e97c5bd58a6ca9a46ae81b3d0e8779bc6
font_02_sfnt_off000145b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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