Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a628cf287c4ee66…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 17:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b8bf6473341c5976eafacb40dd633d0 SHA-1: 7dad21c366fd6955e953d63b9c9fc928c714db4a SHA-256: 8a628cf287c4ee66ae83071110da3d037dec751268fbcf1c480ab635156aa79a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://archism.ru/uplcv?utm_term=pokemon+y+how+to+get+dusk+stone PDF link annotation
    • http://lateonsettay-sachs.org/userfiles/file/74621214426.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/lunonek.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/81407ca9dba56f87d661b2cceeb870d8/39477534766.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/58877893308.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/02e830072c54d415bfef13893b37751a/banupubefifukodeges.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb050c361a---pigejanok.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/85432992129.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077849be26d8---tipujiwofolika.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/ludimutudosofu.pdfIn PDF document text
    • http://itfind.ru/uploads/file/32097659713.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ca12f8ff3724cf4cfe1749670fdb3333/90364230976.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/zevogopafawava.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sutojinotoxogisizutedaro.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/64760360436.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/jokonebagawope.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bf2c8694a2a713c00209421b4b4c3043/95474511358.pdfIn PDF document text
    • http://sparkpro.lv/content/file/gijugumufi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082770e53467---pubanefiliranidupubalok.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc40992ad1---67161090153.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1534a53db8---dijinupuri.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/retanuzukovidaponapiwirik.pdfIn PDF document text
    • http://gabortech.comadmin/file/webosiw.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/31059942022.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_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 17860 bytes
SHA-256: 89c537c5c7323aff7b4054969e6803b86c14f9db25dd6b733a7071aff95aebd7
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10688 bytes
SHA-256: 80841710be7646e9207ae903b2b6e0ec3f83e77b641ab647dc55603df1168ab2
font_02_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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