Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fdecda35e84259…

MALICIOUS

PDF

87.6 KB Created: 2021-08-18 22:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c866bde15fff3afaa5303d30fe5fb275 SHA-1: 3d5ac402793951032453f258d1c02c484268206d SHA-256: c5fdecda35e8425982df31100010e00c68ca3d9e11820d2556810a2497aba1b4
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f1fcbb1d---paletojil.pdf In PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/10324347077.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/rkm3oco3kakuk3c5a08iq432honoh41f/8737656654.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/navekowimikimugewe.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d5c42fc5aa66d230f14d70804105a14d/gemunuponujubu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/3802616551.pdfIn PDF document text
    • https://aashianarealty.com/file/migezafuvem.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/2d29478bc00220196f4f36401dc18565/47608702792.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/73334813549.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/r1emicf4uk7k311e7e1ccufhap/xanejixarikopivaleki.pdfIn PDF document text
    • http://metall-press.ru/files/penilebipimoguvuput.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/kejoroluturetopugiruf.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/91800103607.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/93284508336.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16099c272cdf45---52773709900.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3qvasq3b8id8sbb8tojgkpfof6/81649595495.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/rigikamozufi.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/kexefu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/muxatupoluv.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/58165431222.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/19984797440.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/19341174192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tate+modern+guided+tour+onlinePDF 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_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 10484 bytes
SHA-256: 3d207af0da17067648c39addd118430dc685b72bbfacd537eed39bc6ce36512e
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 17224 bytes
SHA-256: f50227daa74c87d4d6f7b6792d9d0f1ce1d44116d5ad9108baeb45a431492963