Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4fdbded460e702…

MALICIOUS

PDF

82.1 KB Created: 2021-08-30 20:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 273a2bf34804420b581b9881b94cae7e SHA-1: 45ac638f8c9ff31dfe3810ea91e00f630efd8da6 SHA-256: 5b4fdbded460e702f3e9849958ed93565dc24245ec09eaa0ecad22b418c65f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119f22bc6762---46804111935.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc5ab16bb2f---bozobigewemosefo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede0a26da7f---zolova.pdfIn PDF document text
    • https://soechi.com/userfiles/file/45609260711.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/79451381856.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/22414436531.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/0e821a8d8c1fd6128e8141fc8da889ca/6286043781.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/dafur.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4d109e4ed09e9fef4ff80b891dda4313/manuwigeli.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d012038dc4090e08f3258ed861590fef/88512022007.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/476c4630b9f2f41658d1164bdfaef9d8/gowisovenevilu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9410dd9a31---pixujuzixamuma.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0de332447---83688770642.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b38e2c0f---dibexasamapokesipo.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/33005388953.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b343510a4fa---50301138255.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/279abefe29510b627e5070cc43c5cf85/godotaritibix.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/grqijbao3dh0l4fitub80btqh0/39112421731.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/makeximevuwuziligomosik.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/25971265707.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/roboxazapodivelitikubezuw.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/419831211.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/66c93af78934cd2f0b5d5014e8e25752/fedusekogak.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a89ed018---bemelawarokefotarifuraru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+change+a+png+file+to+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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 10708 bytes
SHA-256: b771516fa159e201c3c11b7240b5534544bdfec6875d5fbeae8ab872b3bc0883
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 17612 bytes
SHA-256: 6565edcf280bd2da205fcb1221f325d23f57dac7bed8bec94dca0db2ee8f28dc

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