Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9826593a57870fa…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 00:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 418c002484e3141a29ba8c05db3f1675 SHA-1: 82600e214181bdd57505e5786a662ed56265554c SHA-256: c9826593a57870fafcc78caf02ec65f32ab4109f6b21bfd5c52ab1c667830a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and heuristic firings suggest the primary function is to redirect users to other malicious documents or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=clone+app+in+android PDF link annotation
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/52188060189.pdfIn PDF document text
    • http://landia-print.com/pdir/file/pudikixodo.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/datidazagarinetedupibuxa.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/66459166400.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/34448138512.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/jamapitaxavijaw.pdfIn PDF document text
    • http://slovoveri.org/userfiles/50563414847.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/gozodonotijib.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tog3dks2tqdjv0ai9suq2t8rj4/damelorutajudos.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/vibekufe.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4cc66050ffa9d99bf8b0604e2aabbe7c/590537222.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/44516900693.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/bewugopesibizugurul.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/16502940866.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/20441907096.pdfIn PDF document text
    • http://kftchem.com/upload/files/zopidotezegakuzapubiguxom.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/v9kh43g4s0f4g4p7s5dr3advau/35306105054.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/76505569023.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kutekivumarepodad.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/66448762244.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/tupivasutuboboj.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/rejesonobofifexememe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140216eac8c8---10903647928.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_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10152 bytes
SHA-256: 7fd4624d4e02fc4766ccee783d808efa8519686280d357ce4570a5ba306437bf
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 18056 bytes
SHA-256: 66cc70353a9f905af3d50eda73f4b06fdaffa4cbf6f6079cb0c67a328a3d816b
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1