Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b49a39fc8940493…

MALICIOUS

PDF

87.9 KB Created: 2021-08-03 21:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5133a5c6d70ed3c59c77176302ba080d SHA-1: 27fbc997f2cb08ac4c439617a09db43e256a7042 SHA-256: 3b49a39fc8940493ac81cc9c7aafea5ed1f3cd120a99b379e9abebda2850bbaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=antonyms+in+sentences+exercises+with+answers+pdf PDF link annotation
    • http://ecilingirler.com/resimler/files/98203363092.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/noromosixajelevuzojakiso.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fh3nk4mvak7u5b9ara9sm3ni00/turewururim.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f216c565dc---82172445215.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/39d954615168be295584ed5bf4559dcf/sepafanomuzadubowojolek.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mcl4p3jfple8ggtnsm3s5vq1c5/vubaj.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094b334b6a03---66461205132.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b462f3cc6963b50de6791de8042d81e3/memibulivomivul.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/16480339931.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/bovavukosil.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jalibejitexaduf.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430103720495331.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ddebdeb54ef---2783513086.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762049d5237---mojopoxubezopuxizepavaf.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/69858527162.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/teperudubinosa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9d31c2bfcb12501984f4ff2952b6f375/89261567666.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-07-14-49-07-qciMQYwS.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/90558240118.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4035a1c4---68439347451.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kopesuxawazovi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2719170bca713e3acf1eed7f29acf0bf/20898669402.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/069e17d4b45f8496211d5364e32ff7be/tejajovak.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/51386839578.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdb041d446---25801279097.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_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 11124 bytes
SHA-256: 3628815f20a9979007442c7ee9679021de4508f04981fc0fc908739f37040a26
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 17168 bytes
SHA-256: 7a1b1f7437536795d0577d3a2ce6297440a22931a8f68d4867454ab2fc293e1e

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