Malicious PDF — malware analysis report

Static analysis result for SHA-256 e726313117c9d31c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 01:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 21878409213545fdfa80b4cd4840bafe SHA-1: 399bb25999f7297fac315df72a4ee6e0b3a93e12 SHA-256: e726313117c9d31c08e013175eebbbf26656b5d4a64e6a2e88ea3fde714f1a73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content. No scripts were extracted from this sample, but the presence of multiple external links suggests a phishing or credential harvesting attempt.

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 http://biosurfest.com/userfiles/files/jokizovekabarumolurufosuz.pdf In PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/24090955693.pdfIn PDF document text
    • http://zatacorp.com/upload/files/63758215066.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0f8ae34dde1f318e8934d03150ad370b/49879884815.pdfIn PDF document text
    • https://istanajp2.com/contents//files/zurazakapakuwulaguxogeb.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/patugipopalidododasuxibiw.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/84871545558.pdfIn PDF document text
    • http://zuche0551.com/upload/file/xobewa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4671aa1---42583337671.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/35589423335.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/17648612717.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaeaa4904c---wezitax.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/d6pqfl8jek74942ov1sbi9dhds/25098710323.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/72407928297.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/sixawimusirugufo.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210712_25F3156A38AB05FF.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/61761371181.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b349a06c066---92419797986.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7b4883ed4d155fa61b7e6dbb9594454b/xatisetinuzolitaxixiza.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xisiwixivoxakejadodukajag.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/im6k8be4d1kk2beejj39n8ked1/losifukopadebisilogena.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/s0q20gi393mqs5qtrloo62u8ta/fuzudogoxivufanekimeru.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97bc8f02b6---tesazub.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sefek.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/lejaxuvotuputezaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+french+revolution+liberte+egalite+fraternite+worksheetPDF 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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 18596 bytes
SHA-256: ce91cac968ee92b6818fb342d5a8b90f0b71d7a4c1913a41720f7f76fa949502
font_01_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 11060 bytes
SHA-256: 655c52e7c02ba5cef275b89e7f3f6094abe57b8591bc7fa55ce5ed68617df5d5
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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