Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c19802bfa6803af…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 12:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3708e0fedf50a26156927fc6dbfdfa1 SHA-1: 256e6b87d65a6726b7870216d8fc560b964abd43 SHA-256: 1c19802bfa6803afe644ab65e716162c3cd4410a09ba2fcd183a025c1387aee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites and potentially disposable hosting, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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=activate+office+word PDF link annotation
    • https://clap-bas.com/userfiles/file/90122994625.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161366707cc036---linutu.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/vuzozetamugiroxetisi.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/83057949484.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd1fa4c6a---jegonisadimoze.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/36659893812.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/69475750139.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/fusilesakegusobegekenop.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/pagerolazowi.pdfIn PDF document text
    • http://wohingltd.com/userfiles/76167247273.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/55034351745.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/30040972390.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/kafekogirureba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330105ee9c9---xoruvajopuzotowujenalaf.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/xegogavirenafepivomimen.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pi2rl87rclk26jrbe4q063tdsa/xofoxisedivufesonuradunub.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/71887061236.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/63040147329.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/gobefezobebi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b032fac6478f061518a637461e8a4c05/39890045571.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/71027580949.pdfIn PDF document text
    • http://boki.hu/editor_up/demisikibivuj.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/wipelupemalanisujapepibij.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/17653107194.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/585673467.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16840 bytes
SHA-256: b2e792600b0d18ad7edf18324d4b4bec007b0e7ae5fc03baa193b1ccdcd68d4b
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 10284 bytes
SHA-256: 0dd092efc6001fd87da0f8a2f390df9162ff1f4772a720f56c234bc864b35aa7

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