Malicious PDF — malware analysis report

Static analysis result for SHA-256 285c5fe8a6a4f3f3…

MALICIOUS

PDF

98.9 KB Created: 2021-09-17 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad6ab91fb217f4cb3a9b842cbf825f0a SHA-1: e41a6dfe7d2a15221894352baa808957d8561e0d SHA-256: 285c5fe8a6a4f3f36eb3232579a39368530d96820cc5f0d1c5b712180a83153c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=shoko+tendo+yakuza+moon+pdf PDF link annotation
    • http://dgjst.com/upfile/file/18785020423.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/netorezumewaf.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/lalojewuwobobet.pdfIn PDF document text
    • http://apothepharma.com/upload/files/gebimutavatogopazozile.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/51359386602.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/begekomugedor.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/30012b196617f50bda577b77714b18ac/76351081664.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/23031657798.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/4410594987.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/74412588426.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-14/images/files/45579545455.pdfIn PDF document text
    • http://c-six.it/userfiles/files/wapifarosuju.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/92242453627.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/41900502965.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/22995981948.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/kixamurapego.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/50366081779.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/13475682616.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130dedb7bbf4---84712833046.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf50bf5ec---2349266620.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140ff8d72e99---dibesazef.pdfIn PDF document text
    • http://storemisr.com/uploads/files/tovonexerosijariwu.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_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 24220 bytes
SHA-256: d9172e422ba85131b1c0ee46862d524edcc6f6ad503cd29e1ea0be1a170157fe
font_01_sfnt_off00014b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B29 10796 bytes
SHA-256: fdf9d54300e84694d19e873614dbacfa39c99bd158061d7861d672550ceff72d
font_02_sfnt_off000163fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1