Malicious PDF — malware analysis report

Static analysis result for SHA-256 10717855c1e20088…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 19:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97c1f5676039a7c2347e0c7608d5b005 SHA-1: 26b8147cf6da61acb0cf9a9e2b00630621113039 SHA-256: 10717855c1e200881adefde85dbab3d78693ea1ded2de6dd4616724c43f8eb94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cp-tournament.org/ckfinder/userfiles/files/2260037041.pdf In PDF document text
    • http://skupka23.ru/upload/m/volozivabisogebot.pdfIn PDF document text
    • http://surtek.biz/image/files/20150121_132909.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/lejilefasezikuse.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/83094106130.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/1180352425.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/pezekibenut.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021063007444829.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/67530231007.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g3f5n1nrh2r7kgemvpi9ouad36/80512494280.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf569476a9---suvowefadumek.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cd183a0b8---76663865997.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609644648a433---28265579021.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6af4c855---34471580715.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0rfpvhklgje0ja8270u7ce1bmu/56886327193.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/1109841450.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282717b915---30020913439.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608522edd1851---nilonokitorewexajit.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/2b537d45fad3f986dfe8ccb5669b255e/tikuxizalupopisolog.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be60380f6---kogoxinavovaxiv.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a11d0cc591fb4a33fdf23d1b7adb0813/wexojomadesujamegikugex.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/tefaxivokiwoxidi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/las5vf1iutc8hejmir35e44pag/61238184778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shortcut+pdf+rotatePDF 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_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 10484 bytes
SHA-256: 710c6bac01dac9526b6e1372adf6c540e574acb8c55044e081906ebf2f22138f
font_02_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 17476 bytes
SHA-256: 172351d4a6684beaed907a7554808c5284b078b5029f8797f05cc5c071184a05