Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7d4d32009b8787…

MALICIOUS

PDF

81.0 KB Created: 2021-08-17 16:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 818db986f4e5e32ee26a4d86d8f68c87 SHA-1: 2cd4abc6dd34d1b39eeccc3397a45d6e9fa147ab SHA-256: 5f7d4d32009b8787dbf1a34d57314d8122877fc8ef643cda76de5ba04492e665
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests a tactic to obscure the final destination and evade detection, likely leading to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kaowei.tw/image/files/20210630_153606.pdf In PDF document text
    • http://faurerom.com/userfiles/file/21470364539.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/ludozaraga.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076575eaec52---damujas.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c837a3cdc03ce21ebdc242439a178974/95770594730.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/fanixug.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf55f0ef50---9427055310.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/tenadojizurakakot.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/32400153330.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e68a07581a7---bazazuvesomonigorunakavez.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1itm8pcbrm74v0k76ph0totlnp/4455516415.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/felabunalalime.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e4812857648c8fd23e1d89e288e25d21/rozagu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/69111652024.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/buwopadupilame.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cba2da23c59---zuraviduwadugusenesad.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba9dea27---zaribozu.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/63740966417.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/tuwabirojolopemoj.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/47766330582.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/83551168419.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/09f87d584fe166b4537d807dd76d5f2d/39502243085.pdfIn PDF document text
    • http://newmob.it/userfiles/files/25610166937.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/misivatire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+long+will+an+occipital+nerve+block+lastPDF 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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 16040 bytes
SHA-256: ce5038e52e0e4786d047fdf93da8720ba52069766014e8c22d0f99e21ef2a64d
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 10924 bytes
SHA-256: fc9ff459ea3ac8810f4e5536c64d1b58d7676aa87693c57884790d8f9459d068

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