Malicious PDF — malware analysis report

Static analysis result for SHA-256 1721c50a7417ab4d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 01:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92a6e6c8665dc376bb02b7be48c59cba SHA-1: f3b7aa97395880646f3669e9dcefe3de67e89a14 SHA-256: 1721c50a7417ab4d5ca2315edba627e1c13acf22c0c29d7f6a3e4401dbb7d205
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://afro-safari.com/upload/files/25884028890.pdf In PDF document text
    • https://shih-tzu.ro/files/file/guleporufukefajokapek.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1cee30417---30918222427.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/58166129527.pdfIn PDF document text
    • http://makaroma.fr/upload/file/35327535546.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/bibalulufixumidunek.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/dakimupebejenidoxi.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/18144137368.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/zalenuvedamijixanoxeva.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630743709.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/nikadepemufizekowin.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/65785392794.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/72375414419.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/jexepinufekotojuxeg.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/jedafukabos.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/banibamorisepuvores.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80d50f8b0---rarafuwa.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/jakupuwiga.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d773d167b8---32471372958.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7722960d---59068957744.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/jufirokozo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l9m8c7jp52q7m0i2vgvhphvgrt/93583320351.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109162325246323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=given+at+the+beginning+of+a+sentencePDF 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_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 15820 bytes
SHA-256: 0260ffdfc8d500dbd25cbeeaf23c3a336f046f2d4dc7a81aa6b10f6db301de1b
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 10716 bytes
SHA-256: 464bb6f5f2e7bd6e3d2ddd7a9344e77162a174e080e4b2d9887e7bfc119a1273
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1