Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a1cb8eb350b30a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bbf00a758bb8ba80f74af232646e76e7 SHA-1: 44ca8f709b1a409b6321e781f3fb5af84150d6c0 SHA-256: 90a1cb8eb350b30ac4fd7332a21b704d9da94ec0c57c8ea0f501f17176fb9722
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dtd.com.pk/ckfinder/userfiles/files/getowewevaw.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef261caa7---4674109681.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/pewezefirepevobimek.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/pukizunopeg.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/69164816749.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/oprm3rq8ogfkgelse1sc5u454v/92031262282.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/45863018067.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a5e326d09e345d0560d367f9614e2f8e/xuzaz.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wopenubolovepekufevababil.pdfIn PDF document text
    • http://wp-kancelaria.com/userfiles/file/tizidafevuvakogonaso.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fubezedagugomilikaxim.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad74be33563---livutevebupa.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/kuvaraw.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9513dce9---50495339761.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/belanejolot.pdfIn PDF document text
    • http://babamoleskine.com/files/file/59148110657.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/xajomujako.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/pafekovedovibilof.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/61299473022.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/22610955383.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/xugazefebanurubimuk.pdfIn PDF document text
    • https://manenshop.com/upload/files/11026182468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=2018+chevy+spark+manual+reviewPDF 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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 11284 bytes
SHA-256: bc5e84141b6d7e6f47d92b04181e7aebd55e33fdf229631bb4ac6f7881b3ee58
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 17784 bytes
SHA-256: 28dd75eec536266f7b1f130876fdcf2969342fb4aff25a5e01d6a94f9ae87196
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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