Malicious PDF — malware analysis report

Static analysis result for SHA-256 023cc9d5fb1d6a67…

MALICIOUS

PDF

81.8 KB Created: 2021-08-30 15:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4bde61e14f5740dc17d4486fdff319e3 SHA-1: 3f54e32e957e60fa34f42aeae8c22a9a716b9ddd SHA-256: 023cc9d5fb1d6a6770b31542e46da9814c852ed4f75f9f22bcd8caf17a3036d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external link redirection, a common tactic in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=building+java+programs+a+back+to+basics+approach+5th+edition+pdf PDF link annotation
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e986252f06---lufofutixux.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/lazamer.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/sizeruvigel.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/50264602882.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083cca0024f5---fapad.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/43148656988.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf6226655---wopigit.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/54859457409.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jitadafat.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b742c0964---dimerijun.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c3a2052e---47799184916.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/vokixofisubobazevumodu.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd837743da---32598595684.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077430c5ab63---dexixizudogod.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1uels51np0t7se7a81b7rd0i1/sisuxexaje.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/vutuwelefavopebake.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a764ff2c---45799828442.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/sawezemufipelagetogovag.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/b01mf4kl57a1njspjhh5tvo6jn/57803321667.pdfIn PDF document text
    • http://topstec.com/d/files/suvepewevuv.pdfIn PDF document text
    • http://dogable.de/userfiles/file/bonibexerumegirazalixe.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/98493166845.pdfIn PDF document text
    • http://amandamaitland.com/images/file/91820529101.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/69277449346.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_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 17692 bytes
SHA-256: 728c2ceffc4adabb7e3c168fce4bdba195976be2e4b7c88fcaca1c5bfc1616de
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 11780 bytes
SHA-256: 5dbe0c2601a228a2d89168d42374a95eb7af527d6ca908ca57fdaf0067bb87b7