Malicious PDF — malware analysis report

Static analysis result for SHA-256 05815944bc318997…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 16:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc895694007db6e37d8606265f13bf08 SHA-1: 07a63f5a36060d96c64aa9bc0dbb9c5ac77752b8 SHA-256: 05815944bc31899769bf6279c5579c3e7b4321112df6ca688638761400b35b57
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109af88bb681---50635063310.pdf In PDF document text
    • http://abbwingslynnhaven.com/uploads/files/jopanut.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7fd39ef487831153c715df83e1220216/94808880177.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/tutiparifed.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5be46dcdda222eb19595efdc8a939565/2917126687.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7ebec1d8d84a99f75337a29c643ad67f/44235968510.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6fe086aae---96296364710.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/nonegedufupakifuw.pdfIn PDF document text
    • https://armenia4d.com/contents/files/39561356179.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/vunitavonixumazuvak.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/giloboxubiruvizovinivijol.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/pikigatiwobino.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf8be280e0---30942737305.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f21113d0---zatiditakonobozivexev.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/2954132513.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/sematalaxunedobe.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6cfbb209---30164374227.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sk0m9ecqbkj9ubpr80u5ki4098/35277232385.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xewitiratak.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6720aae8780bdb542c2ad3a45e2c5b1d/vufisagomub.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/58564536777.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/76088304041.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/zurigive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=russia+currency+in+indian+rupeesPDF 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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 17760 bytes
SHA-256: a8615a2d6c8f67ce3019c3aaece7c87447c5c1f064c3572c074649a14d7808b9
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 10504 bytes
SHA-256: 6520a09f75df6705fc398ac4a6d6f778583ff9ca78d987c6a40f21ff04fe4171

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