Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fbb530b2114f5f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 09:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70af16c0645392ace99af8919894a707 SHA-1: ade9a33ba043204739e0f6b5da5ff6f25200589a SHA-256: 10fbb530b2114f5fcf192dee37dde5ec63c1281c9e36aec97486640e5841336c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The numerous external URIs pointing to compromised CMS upload storage and disposable hosting further indicate a malicious intent to distribute further payloads or conduct phishing operations. The ML classifier and ClamAV detection strongly support its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://archism.ru/uplcv?utm_term=mrunal+economy+2020+unacademy+pdf PDF link annotation
    • http://studiotecnicoforace.eu/userfiles/files/48680726545.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2276758b16bf87a5a0b952cf13dec8a4/nonobimuvemep.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210808_DBAEC0EF9480E454.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/woxad.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/380af84897b2160198869c9e6081d49a/rejidagedipaparoboguvesox.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/niketemezolalif.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075008146a93---susigifefegadevu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e140f0eba87---nenivowixegevetab.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9c031f7dcd4398cca1fdca211a1c9d1f/1376194433.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/vqt0p4je0kc7nk8139rc587a93/39020192328.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/27e679f5be50520f081d0260130bc504/podemoxafejolitedodadul.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160824db67a932---xerotavewakotojenexibixo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a50a83dd---pamufapu.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nomubuxofudu.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/92428650959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c75d5af5---47614445709.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb905550d3b---50726314808.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/xavebometanodipamebep.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/dosegipefaniri.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/18ee48ec607125d1360564d627ad0933/bozuk.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073635f330ba---sivelimon.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1082fea442f6872d3cdd3799ba04d20f/kivuxebuf.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/pepavujujuwo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfd36ba72---rojikalefimaseke.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a106dcb962---70174537084.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160888025f2cf3---77252754511.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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 10872 bytes
SHA-256: 78d62421bc7a7badd40cbc69698b2c237477bf64c8b45afd9506f418d2c92b24
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 20648 bytes
SHA-256: 0241237b6698a6ec55680d43e2cff8213b5d9081cced2830e38b65e0f03ebda5

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