Malicious PDF — malware analysis report

Static analysis result for SHA-256 0122c21e16ad1459…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 14:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f31e038299db62b3bce4b8f8464eb4c SHA-1: 0fbde91a98e9fffede9e5292af2f300747cb7f43 SHA-256: 0122c21e16ad1459b10199732ac141b4823662a266433adbf7f8ce71e7f141e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=recession+proof+investments
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba28b1f10e---xejagidere.pdf
    • https://divinenine.net/userfiles/file/genosuxep.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e37ebdb5ea8d873cb643b87e7726ffb1/92631648756.pdf
    • https://basisnomor.com/contents//files/xodupaxikapobubemavade.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff50fe7ae9---90448793283.pdf
    • http://kingalbertltd.com/uploadedfiles/file/99328431446.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fa2cb032727ef3fd8451a03af0587420/89916521298.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/fezux.pdf
    • http://eska-lift.ru/userfiles/file/76377834738.pdf
    • http://asesorgubernamental.com/images/file/forumajadotu.pdf
    • http://atut-biuro.com/uploaded/file/nupuz.pdf
    • http://altinay-law.com/images/file/lunab.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7dd8d10d99cca709e89fe7aae2c8e67a/kelazemuxezupa.pdf
    • http://aaaexpressheating.com/userfiles/file/xaneferorilopiratagosub.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4a66efca---susamiturizadavunawut.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973be4eec86---minujutosugom.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/55018fe66825be11c28baad2ca17a6d9/zibamajatixuvofib.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7c68364---noduv.pdf
    • http://usa-ex.com/4939609512.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b9e6c319c1540af8c8ba7fb20599c4aa/22645727245.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a232295b644---20423208980.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94090555a---bomanenamejomijipe.pdf
    • http://accessiblevehicleservices.com/userfiles/file/letomiwipozexop.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mijewulo.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608031cdabea9---sakejiruxutapejo.pdf
    • http://nordicaluminium.ru/userfiles/file/vitegebigudejam.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/zajopefepiwemimote.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28e.bin
f454def88ee920b006eee2329fe106d63281f18b98918e8837441a2d28270605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 16624 bytes
font_01_sfnt_off00011dc3.bin
a6401d63906e0b644e0ba8164d84ca2649bd80392410683df632132010d71026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 10544 bytes
font_02_sfnt_off000135cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135CF 16792 bytes

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