Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae05b6f817d698e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 15:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7c1995ab1ed6b884a3eddda53d87caed SHA-1: 7dccaec42be32dbdc19a52ace73dcbfcd86d88e6 SHA-256: 7ae05b6f817d698e7a4af444b6876a346f9805c4a8b79d14073277e446eb5904
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92b0a3545---zitikolimirutebifikaxasu.pdf In PDF document text
    • http://dailitara.lt/bites/uploads/file/vusuwekago.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48907e829---timububisegomagozobifofe.pdfIn PDF document text
    • http://kleiberit.ru/files/file/kotixunif.pdfIn PDF document text
    • https://polaria.cz/images/file/zetonefotaveriluxusad.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/xutosofumiwina.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/2883391766.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc79470549---41161438918.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/32659726636.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fb1c889ec13e4d27e8ab755bd05e4e56/sakizafogasopukako.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d63dc3b9fbe---livugaxutetixejum.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fefapisem.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ec21a3a3---58775993430.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/lonrfeup58h027b578hcd0l2n5/wofigesukebuvokuza.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gubudamuregaxudugoxel.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a328a7157a9---ratirivawobanudit.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wotajimizagefuwunivip.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/kiwagedazero.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fae6fcf05f4a8349dbef3f1f9798f04d/wajurakadidir.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b91515b5bd74ba9b5e37a96626b2f921/vijikiralunusazapulotamix.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/10357305781.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507021049393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dictionary+words+starting+with+tPDF 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_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10672 bytes
SHA-256: d65354e870e4921391bee4f5ad141f45fd1f1cb5cec1658e75581c9e9b39398e
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 15992 bytes
SHA-256: 84b7c1b19ef4e82c90750b7b540d74c4164b99801909b1efdd8a86383ebe5d8a

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