Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd702fbdd4d0a0f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 13:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 037694a43fef53df4e8f0ea02456a584 SHA-1: 51b574aa40ab763af2710aad90c0dccf30b29bdc SHA-256: 7fd702fbdd4d0a0ff14c452b52f94c1e770178425351a06bf602bf8e5fe07b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=how+to+play+guitar+tabs+pdf PDF link annotation
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/51796796970.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jusebevemimanaresa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kixuzezavagomixonomizevud.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/jimivoxurajuvezo.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/96803136089.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/805119c8e901d9c35485eaaf504838d3/89000968821.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/3110636232.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/f2j0v5cjmdql72go82nh0mjlnt/79575930134.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fb1da6d92ae54666dd2694cd70b23bb8/63332466115.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/40748142735.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/49329901705.pdfIn PDF document text
    • http://billsky.ee/files/file/15152176127.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/malozulolov.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/49180196864.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c84587ac---31075243423.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8450a3519---23333851084.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/194f06550fd93bb9dac5b99f9f0ecfbd/lumoposunu.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/butuzajoji.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/33377540940.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cnvbtp14dvm9eqij16hrnec095/79670422780.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b084cde96---55776623457.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611f498e868c0---16059056222.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/45397742358.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/9931994068.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/golagivezodadu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7d2976cb---gusogasewewodowozixupax.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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 10868 bytes
SHA-256: 3b7a369623084c04d0e9e6f993c096546a1a91b7488e295894a3c2d78785bb39
font_01_sfnt_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 16232 bytes
SHA-256: 3baec48f91847044b4dfc8cbce02adb47a41998155f1e25e7c628a7ff7a60b57
font_02_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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