Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c3c240b05f1667…

MALICIOUS

PDF

104.1 KB Created: 2021-07-08 02:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 794a0b0aba5d2bf2c3ded75d764a11d4 SHA-1: b4e29d4239f9a13a78edf7a2f6496360364d2fe9 SHA-256: 07c3c240b05f1667192a762a97b1f734c022421dcd423812ee60e2c1cf7e4dd5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or domains associated with link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://philabc.ru/uplcv?utm_term=top+100+assets+in+the+world+by+market+cap PDF link annotation
    • https://foulardfotografando.it/file/17721126010.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/97127922804.pdfIn PDF document text
    • http://talleresjpg.es/img/file/36205382445.pdfIn PDF document text
    • http://shosholoza.de/file/jovepigikopujeka.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396ab3a08c---20290750964.pdfIn PDF document text
    • https://securitydm.com/slicice/file/vewadexeserimir.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/37789253202.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/43af487eeaf024cc0625b2880e94378a/35086376318.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3bb207bf1---1122044175.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f9d78e15---9028816996.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lejudisegewokoneziva.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7f333358c---rifogagegunaxi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/g8sb96k1egoso82e95q06a7siu/46656255936.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wominakixisit.pdfIn PDF document text
    • http://capital96.com/userfiles/file/88353997706.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nujek.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/77877473925.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f004a8ebd5---gukikotitinij.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1438e582---bubigutem.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///buvinubekapijavula.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1c5cb0831e564f5c39a0e351383f26f3/16965659019.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52fc03cd2---tibebudedevisu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e94569e06---salijazumepizerajo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db6d183e78a---bizegafuba.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_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 11348 bytes
SHA-256: 3c4a9fb2bb605677461a69edfc0f6ebdaefb24f5e76243c0b246fff66e2b9977
font_01_sfnt_off00014b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16336 18024 bytes
SHA-256: b5c2d9dddd1845f5b4ed47f6cedac114f39666f7379f7641bdecbdf32451bd31

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