Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ed664e189db11e…

MALICIOUS

PDF

95.2 KB Created: 2021-07-14 00:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d73befb6a6e841e46d8123ed1ab2a93 SHA-1: 89a4e3f9ab9feeef69338477ac3729fea942c18f SHA-256: c9ed664e189db11e46f7cf0542ea0043811ba2ddf0598f6d1c7f70172741e883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded links indicate it is designed to redirect users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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=specific+gravity+lab+report+conclusion PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9454efe8d6626ae2104a034a93b77814/63398436840.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/2260037041.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/030e2f11405937d76bc20abceb346f66/46784842711.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815862ef7cb---50141418020.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51018ca86---34577199157.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/kobarinulupozew.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/selutorijopogofitasivik.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/6991395560.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/47932380479.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/zivimaz.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/mugimefuvuliwokavetifebo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b4dc626380c5869bd9b5253f96c9f65d/98624822583.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/pozamoxijibuv.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef29dab653---36414670476.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8764a9c706fc21cd88c258a6848ff88e/33786804736.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30aa0e1cd2---71414734405.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/37730628066.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160749f999ab79---8091021565.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/56514411339.pdfIn PDF document text
    • https://asiahijau.com/contents//files/kifazuzuwipot.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/56370875596.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e47c2c86---budimevutadabura.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/12250701842.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_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 17824 bytes
SHA-256: 0c7043f1ad7da1461ede6043348d2ca93af5d91ef5adede87e3e7c5d339ac9a7
font_01_sfnt_off00013d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001556a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556A 11152 bytes
SHA-256: 53061e855bf1ae3b5a4c63b0f48d5962cf424aa8832215a13c7f4b0b48ac8413

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