Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ab222e811f3a28…

MALICIOUS

PDF

98.2 KB Created: 2021-09-02 04:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83df8a69d16ba5150a4374a2baba3386 SHA-1: df1428253c43af0c8b477af3cb6567cde1bada29 SHA-256: c0ab222e811f3a28ecfce6d6afaa2c3587d9c2dc0768fd4fe0cb24516bff60b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The embedded URLs are likely part of a campaign to lure users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8d4geqf8atvihcamkp14i3nd07/82443881477.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cf585e56---zutufewejox.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaa774c0e6---55847597386.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/xuvapozirijujavosedij.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7091b8ab---73586987146.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130253874c1e---zamab.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/65618295163.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/4178209131.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pikavuwimagoketuxipowipeg.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/74116be5474b1cba008a43b0f1adb9f9/70198425452.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/5404247816.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/71922783049.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e05fq81aij1e4e62gqiv7n997/99258980446.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/26234388777.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cf090a1a81d8d9e39d780499fba77017/lufokoruxewo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e94adc7c74ad8d72fa9d8868dec15d4d/55089982266.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607039bd5b431---pewotofale.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/52586315891.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/depapelodevedot.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25f61bd1f---47936215167.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094528a9fd73---wanesisasesojifatos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+does+very+much+meanPDF 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_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 10768 bytes
SHA-256: 19435c33fcd1d22ead37de2d278b2f7a9fc2128ca598e4fb20a47b72e3925c04
font_02_sfnt_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 22920 bytes
SHA-256: d7a8b03d6e9e870d8f234ae6362c5ff0ec1ee222198508019e2ff51063ac2f91

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