Malicious PDF — malware analysis report

Static analysis result for SHA-256 5603014b7b21c1d6…

MALICIOUS

PDF

88.9 KB Created: 2021-08-01 07:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50afb1eb490672bab8febbb9cf067622 SHA-1: 02586d7dfa19bdccb413a55be275d713fff6725b SHA-256: 5603014b7b21c1d62e4beed5c46271fa519b3fc16dc4d0c7b1bd5e50b51aec6a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919320f078---33233636112.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18c224cdb---xaxogizena.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8655daf68---jusekazepakitisogameloveg.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b3ed2c4517e7331c65cef38e7b716666/jumefozavelumufef.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/bbc232da03f04124bee5e4a6aa3d8675/97400988631.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b7798e5f34b9341f2c1b99be482935f1/82803066310.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec9be2161---77076500433.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/xitumivavebe.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zinefilosozujizisojapaje.pdfIn PDF document text
    • http://rapet.hu/files/47465798108.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3495cfe40ed8d33236ae4f9737cdea71/bemoledobufasaxuwo.pdfIn PDF document text
    • http://muszempilla.com/files/file/fapotekipegelomilo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5454a1b41---63942550152.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/sobavopugetufamofimus.pdfIn PDF document text
    • https://ahha.az/userfiles/file/xutobew.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/52089055917.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb341cbf3---zujavidofaduvuwilobixowe.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0b748accd3754d1fffa16fd13ff1fa1d/24117426943.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xezifuselaninowisalofefij.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/muloje.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/33929065656.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c2c018e6---zijovobanefojisawobazut.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b9c1a822e---46630846682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=qu%C3%A9+pasa+con+un+ni%C3%B1o+de+4+a%C3%B1os+que+tiene+5+d%C3%ADas+que+no+defecaPDF 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_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 11404 bytes
SHA-256: 2a8168dc4feb204e0171eae8ab7ee41f8d1e4da9b415e02f9572d26cb0998dd3
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 18268 bytes
SHA-256: 337ba694308a37ddd9554ef6da7eb11b362dc7e1911ad99ee7e2e8e0cc88153a

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