Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7812d79fe5f8104…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 11:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b358112c5217f519e4c956ca31344f2 SHA-1: 9349fda39267a5a077702e4df1208e4a004db950 SHA-256: e7812d79fe5f81045b4a483fd4fbdfbb11ce7644c426eded1a17aa92dbed48d9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary purpose appears to be distributing malicious content or phishing by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=results+driven+performance+review+phrases PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0a4ae46f5a5a4ef3100dbdff80a60f76/runenekav.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/41113039809.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4be16ef9---kokofixeju.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094acbf2385e---totamemazugatip.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/wotuxoral.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/wofefosenoverepomalejuk.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jofinukajixosunuta.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7e5411295f28267bb9cb2de2d0c7a054/sejemotomevuwikuka.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/86195523418.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/rabadixuz.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/24049370106.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/85284313729.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54cb3bcc49c4c02278bfefb5dd7b57d2/98379312246.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/jogiti.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/15567736238.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wukeziwelekex.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8d4nf9e9td4q92t1a5pns1f3s6/72796924575.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohrfnsp1gjhi9ptfvb7m5ms5pc/zuzaxef.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160aecbc8031d3---31485962395.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/31806266249.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/73378059079.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.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_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 16704 bytes
SHA-256: 4b024ab8dc1e629bd87940a878bd9dde59859a8691a289a60fa29e2f9de21594
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 11180 bytes
SHA-256: 21ab7aaeffa7a7b303c591a443da825a23860c2ce06dea2b98c33562781c14f5

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