Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a180e15308fb714…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 05:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 748e64bc1ce839a790b8c90b2bd3cc70 SHA-1: af3330ac51aa963fde5f35874265ac5f226d10e3 SHA-256: 5a180e15308fb7140ac20c1c8d88c37692d9ea609eb82e31c1c749bf6ee45e2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to lure users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://inwebjor.ru/uplcv?utm_term=react+ui+design PDF link annotation
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/89236426065.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07c92530a---zarimuzo.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/51524661089.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/bupovivojivurupabene.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/maluvoxogefijav.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341b6107907---seziguwawozupozojexik.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/lamub.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/28873485882.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/lawagajomevodonumuvovuj.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/zapino.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6db747ca---dewesenemalajiga.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/95570114482.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/64010860049.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/381pubtv4pa367sp90peuldhc0/wemejalefujebirovad.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/30883401515.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf64d825a7---30064696334.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/jebigamajedo.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/defufogi.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb7d22f83---83553807991.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/89764893894.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132225287084---kavusolamal.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/1876235918.pdfIn PDF document text
    • http://opersan.com/file/vawanulozigamibizun.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/11663845847.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911041257185.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/morufunimugatuwoxalem.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/50072858457.pdfIn PDF document text
    • 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_off0000c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10424 bytes
SHA-256: 5f72a37ae007b6d72e2a85711c9188898aacdff488e5d65b9db830101ef3ddae
font_02_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16564 bytes
SHA-256: f3c164d6b10fd73f73e0891b841ef2da7607c7df2318900059b0b1fbb002f229

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