Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b743243fb1c9366…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 03:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4c824926143d7a609750837e19d506e SHA-1: af2c98598998f2348bf0f304933294022d493d67 SHA-256: 4b743243fb1c9366f8b0d93a7822d4003f2b4878037be039c1b3725cf31737ff
96 Risk Score

Malware Insights

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

The PDF contains a link farm with 29 distinct links pointing to various domains, many of which are hosted on compromised CMS platforms. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's designed to direct users to external, potentially harmful content. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344e7084a99---lexobabug.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/35fvlau24q43ch44pdefhcvn82/melukuzomewewenuxitazodu.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090403073258.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/eiriovh48a238trashkrnomkdlidbv5v/womex.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/4609427929.pdfIn PDF document text
    • https://ever-progress.com/upload/files/13000590109.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/57256961442.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/ponotuxem.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/75504728023.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://pmms-online.com/assets/file/90510629897.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/xowanasonuxilox.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/80008977699.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tawazupajupexifewovo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/tuzatazekufedipetufixex.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/safopevawexinukinas.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/gomibokovuno.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/45755562470.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/75313605984.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/54541788207.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161344d520a361---30826814713.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/86113261389.pdfIn PDF document text
    • http://ibb-online.ru/f/file/retomupujokovikaxatakad.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f588d7746---30895764067.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/repufevajupolin.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/97154606104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+get+cod+points+for+freePDF 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_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10664 bytes
SHA-256: 11ed358ecc646ff23fdf7ecda5842d127ddf5d342385de8f980bf488caa90b51
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 17200 bytes
SHA-256: 358f3494a7316a8cde46631f09a8e72d40abaf029e7af5ae292a6d780c317437

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