Malicious PDF — malware analysis report

Static analysis result for SHA-256 046a3dd2c357e807…

MALICIOUS

PDF

99.6 KB Created: 2021-09-03 01:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd35da92b9390a95ea3c5f001a9eada1 SHA-1: d4b310ad7e857d0a87bd9e90a903d45d66583e2a SHA-256: 046a3dd2c357e807ac36307a69fd2ac2d70ab1061feae99af687ea92d8f0bf4d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. These links likely lead to further malicious content or phishing attempts. The ML classifier strongly indicated maliciousness, and the heuristic firings point to a link farm strategy designed to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://ketchas.ru/uplcv?utm_term=historia+clinica+dental+completa+pdf PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e9e88fa4---lubowomoxufeno.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210703085229.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/28466087810.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3792d73b80858ca5ca08970f1f188144/jovazesobazupepidureku.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/41234407136.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/99488115980.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/aace15e3f63a72bb852c364ccbbd563f/6842347769.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9a002ee023fde4177023536e3fb2ebf/kedogewoxabov.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28d7807123---judafegevirarozaxozufe.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/fimukubedetikim.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ef0aedad---siretefana.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/fekodip.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xozajuwafu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7714e57367f27b204be95588e85612d3/mufuxa.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/luxigumurabimowirogavav.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/jowegibonufidovajejinaw.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/lazumi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161283d3b56178---48990835517.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f85131e92a82afaebc656e361dc9abf5/9182163609.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/52268944015.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/batiwa.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/76011145601.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/46882739800.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75126da354---mujuwamav.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rabutidojekazunaxe.pdfIn PDF document text
    • 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_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 10772 bytes
SHA-256: 3922adc06ab97fe304e7dbd93b8497db8a14901dd6845b2503a734059d8d00e5
font_01_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 20408 bytes
SHA-256: 0d9250544232c844603f8062f853b74ed5bd7bfbf5bd2f4ef175cec5ed8c4a2e
font_02_sfnt_off0001688e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1688E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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