Malicious PDF — malware analysis report

Static analysis result for SHA-256 0763d4a385359b7a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 20:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36372ddea7939c3ea7c6437d10c7c85e SHA-1: ca22f2b7dfd7761c5b65d32fa961360f5eda4df7 SHA-256: 0763d4a385359b7a231e190a6358a9126b6644145e3d4a258c5546e86187f45a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These factors, combined with high ML and ClamAV detection scores, strongly indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0887bf9ab6ee563762e88e5d9c7ef314/rodelurafidekagezovu.pdf In PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/65449702202.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2d424734---6185066170.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/kokilimirijukipapibu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/31024771178.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/56074509633.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e1aa7047---jamewe.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/28718960700.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/zofobedutafuzomej.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t2nfceufkbollv8hlasqt2ed33/85835673724.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/nobedebaxaz.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/webejemebunukuvokipudopa.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lq9dok8vmaceg105f9jcbja4q5/jalenexi.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosazironubujogetelosopif.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dcf7a3675015164ec14029ab979d9eac/36112825367.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086fde6c17be---254365631.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fj1peo2qmu1fopn9hclqi21cg7/dewawebijawowodogojib.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6e8b8d33---mosijasiwukirurovu.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/23331913254.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/90053206615.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/malijebejiziwuxesoji.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/8117676396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ultimate+slimygloop+instructionsPDF 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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 18952 bytes
SHA-256: 93f896a173c7c0a1a05728c867e0324e283cea9e922765349918bb6badafd69f
font_02_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 10940 bytes
SHA-256: 847fb8be4edf72c20eadd40f08f814a440f2e9300105f71e31c576c5be4b8502

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