Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd195ce2edf78fd7…

MALICIOUS

PDF

125.2 KB Created: 2021-09-07 05:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c2a7e9cf5b36dc03a97c617e56eacd9 SHA-1: e81ef873daa8f9cc05cf97d07d3667366231b9ee SHA-256: cd195ce2edf78fd7b1e95921cac6ba48da31a10d2aa872271e3adb7cd8459919
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://kistours.hu/userfiles/file/11022234130.pdf In PDF document text
    • http://flygarfield.net/userfiles/file/bisomavaforun.pdfIn PDF document text
    • https://motecx.com/images/file/tojoxupokudilavukud.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607084f9de692---83637939094.pdfIn PDF document text
    • http://annabarons.lv/files/files/34932621133.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c88974a9d69---47359886727.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210816214513317821uhyu9r.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qvgc1rd1uho97f2a57hr5km0s9/kifaru.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/89405510981.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c87ebda26---71318236878.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e439f25e---70953730792.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/gunigekewugilovufexesote.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607191f692819---gizilegolufikekalenebi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073acf06ad96---28154365649.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c4ef52b9019797b205a516585007dd40/70342834033.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/93420326143.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fffc72deb---gatovewejukapi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/60578fd1a98508aa7db1c6f7c86a679c/59852704585.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/18506710226.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/efbe1ffa3c8de8aa59a5c446446217e5/49269610936.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16251485831057.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/12765082e83cbf68cb4069adc0ca9844/49577135503.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160826f7cd09a1---61487157432.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/68211830751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=communist+take+power+in+china+worksheetPDF 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_off000184a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CBE 10904 bytes
SHA-256: 139c045d9c7af05440eac6ca58e27ddbf21b475f6f45d1d69432f0effc0eba08
font_02_sfnt_off0001b5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5E8 18576 bytes
SHA-256: 934d3751dcf74bf6b0814bb9aeca8fd0071d75135b77463ed1b0d7c719485bc8

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