Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd4bffbb150790f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 09:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af800d6042abb993e86e730fb0606181 SHA-1: 8b9d3ca23b32370ca06d52702fe3211abee4103d SHA-256: bbd4bffbb150790fce69d81d38f4f4672222ec79402a7da6e2a199a5f24fcd5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, indicating an attempt to host or distribute further malicious payloads. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e0196970f---zedegupusuwisuxugowurum.pdf In PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/4662451311.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210507071018562055j8tylr.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/48362646043.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/tegedijukunewojub.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/es1v2th0oc18t9l6fnilbqb1dk/90443650870.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9ad6f255---ginimizuxivob.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f69e03988---ximebisupapusanonezavo.pdfIn PDF document text
    • https://digireg.cn/upload/miduwonenuxawikoterepug.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/84446117485.pdfIn PDF document text
    • http://klaaswester.nl/img/file/kasudiwixorepo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/38126029992.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/pugedipuwejefubebo.pdfIn PDF document text
    • http://anpharma.net/upload/files/diguwojorulupagupogixaba.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/99333998612.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f408b26afc---mapigewu.pdfIn PDF document text
    • http://beiks.info/public/file/81720691580.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/tifitamekaxiz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce596e102---xunoxek.pdfIn PDF document text
    • http://dzbnf.com/upload/file///68300411623.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/67814404042.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/25203537655.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/gitedisazofuwatolusalus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ancel+vd500+manualPDF 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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10356 bytes
SHA-256: 39570b5539d7a36f3f9fa641b96f17a1d9d5c79817c1700e6268d7efe15c5437
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 16688 bytes
SHA-256: 6e6a5c48d58eb9ced71e97e721999776f449fa2872bb71e4449314de0c0d0d40
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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