Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d556be18b58fff4…

MALICIOUS

PDF

92.0 KB Created: 2021-07-24 10:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7777e472b90c7ea9dc51fda33a75b063 SHA-1: f7d7e2c4f39d9b615898697aebae8276b814dfce SHA-256: 8d556be18b58fff4e9b6d9b62402ece2d0ac424d3e88e24bc8ecf7c5a48ebe16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5962719f949330bed6ed198f319029c4/45684947259.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e23f63edf03---tufunelipewuredu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/evci69mpe9rjunorkbqrg8c94j/57624434849.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b093d5ec9cb---36249431388.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e012cc0740---befajapelefapufuze.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f14f9308d0990f80011c066f64d4a1d7/kumafezijapidurut.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/25168480341.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/dezusisajigipufezogajasov.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/37616293907.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/kakijikig.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e8ef2e9c00214fea36d365e46db137ee/7131778996.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/zimogen.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fimerafon.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/62db38908d83cbc85404e414659e1a58/gudagadig.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c974e012499---8833315275.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/gamofujitakuxaj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae89cea48---92199211917.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/pazipebipi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4e37b24dd---49099542877.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/279bc04b2244d4a1f95bcbba4f059325/gevuxufiduwapakakonepumi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607811b1aa8aa---nufitojexolibevukef.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dedf224df---95220804341.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/28915797714.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/009sits60r6ir9gijgnj2sbig5/sowode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gifts+differing+understanding+personality+type+by+isabel+briggs+myers+pdfPDF 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_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 11236 bytes
SHA-256: ebaa6f1db139d6564fd069e78994082c1010e5e7c9c7cdd64dff55b74166030d
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 16548 bytes
SHA-256: 5b6c5d76ec72eb93c7130569bfff73d0d11df02f4a41c24426b2821de3ca0e15
font_02_sfnt_off00014839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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