Malicious PDF — malware analysis report

Static analysis result for SHA-256 d230736347f0cc90…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 17:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0f3ae97045878b2c8c85c895bf68d55 SHA-1: 75e04f5721b7b2e5d17af195b89475696373885c SHA-256: d230736347f0cc900679a0671f6f0e21089a9a678ce3c42acedd1a9f773ea109
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef4615e459---fojenaxowimiwakuxupiwijam.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://webhenevents.com/clients/868374/File/95032290809.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ae150fcdcb9b4e7f9091a9417a1792d4/dunibibeno.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zodumeka.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/11403478389.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/97746937451.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/nijakugu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/66920922638.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/gagejikiwirawubibot.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16113bbed58788---lumalave.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d749c11fea7ad0883a670a16758fad24/rutedafesagexevepajosoxak.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/gatifunebabezujafajij.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/13519406489.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/71655813824.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dc12a75b---xoxinemedagopisojomutu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c5c9025784f5855799ee98e639355b92/53164032138.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/vilamomibumalatozenovow.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/18030501416.pdfIn PDF document text
    • http://gyobel.it/public/file/wumox.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc020252d---41628957816.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/62242722442.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/85907286353.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/46387537637.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/75266469898.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef4615e459---fojenaxowimiwakuxupiwijam.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/kosijafuzareg.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ccfcd53fc1962fb5d603b22fe14a203e/19651736679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=second+and+third+conditional+games+pdfPDF 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_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16848 bytes
SHA-256: ed403ff565370121dfd9c56549fa2d104759f13d2b2d03c1bfa11777ea998aef
font_02_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 11140 bytes
SHA-256: 731aaa987ee250a80dda048fcac2e68e156d86f2e5c64b8085a128724cee7e98

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