Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8d53603137a4da…

MALICIOUS

PDF

97.2 KB Created: 2021-07-07 00:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d92ea5c74c6a62611050ddf455e89ef SHA-1: 8c5bfcd23ca8163233ddda2a773685da4c134e97 SHA-256: bb8d53603137a4da1707daec8937177b910f9d4f4f2194efd50f7751bd479f87
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fsoa.cn/userfiles/file/zefis.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a997c15ead---83866331309.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/rgq69qhc0ot5ktv8r9kl7jmsq6/95696243727.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a10f7003d---35771045979.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fbf5b6c7ca8ad7819043a5157ebea1d9/diboronuroxovadosulufuzu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/86112f9982077f946df6d63513cb1a46/5455168474.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210611132443.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdec20f82570bedec25fd113706c00c1/42224111030.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/i0a2qjnfl544saf60qg390dmt3/zevonufusutokunesu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c49baeaae---17528153462.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/ziperadalazenovuzagif.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/75685149589.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/diwadawalakowawumagebubi.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/73067744956.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/201ac656fed210d739dc0da48385a394/13673357087.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72c899239---631923063.pdfIn PDF document text
    • https://bursac.net/userfiles/file/gosupuxumedofidubuzesug.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086824ae178e---28671953153.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde33e5aa34---refizugifutinopisiwul.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/60607835565.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/77026345866.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bdpq5fptq9kma3t7f2anbmmhi/sarufejuzex.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609079eecf67e---verik.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/875d0d2d10969299a5d2c65445ecd5f6/92780758609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vpet+20th+evolution+guidePDF 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_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 17400 bytes
SHA-256: 2dd8c265665c1e29e66e358f396b7e8042fd55b61b0116bfa22c560cb6314437
font_02_sfnt_off00015e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3C 10616 bytes
SHA-256: 1f328c2202bbaab6ba925147c889606c183220087b6d007d2a59dd3aac82b3b5

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