Malicious PDF — malware analysis report

Static analysis result for SHA-256 602acc4d476f2e89…

MALICIOUS

PDF

116.9 KB Created: 2021-07-07 16:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ec678e0e5e77b3a09afe2a9707f5d6d8 SHA-1: d50c8c3dd91b6e43a77751aeecbb93c89dfe9e76 SHA-256: 602acc4d476f2e896417b11f67254dcf15f6cbb510edccedefebd3930953077d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No specific family could be identified, but the techniques used are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://restravel.ru/ckfinder/userfiles/files/woloxoriwufidewawuzafemi.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712bea4a65---vimejavipemuxe.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/58e4e112162b68b1e55729036cc7a9e0/pukumapareperebab.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/75883732487.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/45234070834.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/87955997499.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/idirr2npoem5u6t65i5qetjbe2/jadugebemaluxi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608842927ffed---dekesak.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/bizusagixujosapupiwisej.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/84513159978.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/nojisijumisepuxubedo.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/33027997310.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qf5740naaubih1m9qt08puu8ft/27519002150.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ae5926ebc10651db19fed6f0440d87/13779067138.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106092354211844.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/01c442aed65a0ae66207d1c1f57cc03d/sotipegeraregiwip.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/rusigividotavopimuzumeti.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ahbk4ac2ka6940hkhod4l369en/69021321033.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072977dd2840---tiralivoku.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3a409ff530f4802a06873c7662bf9045/5881677273.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160706bba0ddf7---44335312041.pdfIn PDF document text
    • http://nfc.soo.jp/file/2476563326.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096c82be66e4---3818678592.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609400fa0c9f9---95657894827.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835ea16cc64---78899019128.pdfIn PDF document text
    • http://amdind.com/userfiles/file/fivaxexijepipafiwes.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092bae5484f0---90078154908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+following+pertain+to+ribosomes+during+protein+synthesis+exceptPDF 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_off00016507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16507 17316 bytes
SHA-256: 9d2352b212b27ca833da33175b3655c3b71af0531b7a50df9b436c9c55812332
font_01_sfnt_off00019275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19275 11572 bytes
SHA-256: 02e9996082c75cfefd3c1226854e33b76053e75b20a41d972cb350fa414d314e
font_02_sfnt_off0001ad6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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