Malicious PDF — malware analysis report

Static analysis result for SHA-256 314cffd84f10fb5b…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 03:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ebe5d7ce83b954fff583a4722782d255 SHA-1: a1cdb2340dbcb517ac96df92bc472960a70e7381 SHA-256: 314cffd84f10fb5b4f1da8ee336858e33aeb882fb6089feca8e10ede16fbf3c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=periodic+table+of+elements+and+their+uses+pdf PDF link annotation
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/atj4q41omegv3vj3onhelfpd84/69268199563.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/xunujorojevuvikenomasu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9123dbdbb37447c964f4bd77840bf6b3/nidadowe.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/savulivalakewureviwer.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844f4bd0f22---joduwuxugij.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1vd5vbtceqh45s6c8nh3rgpsn3/xozisunakiveketa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe73c1ff92---davopofavofenonamevor.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/9338012443.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/kovasasodemeroxin.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fbd7e9a9---35196404869.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0e03cc11596981da12b735d181d540e1/rejinara.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1edbabf3c---76321760344.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/mawodoluridu.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/975917151.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d220927d---wejujuvofununabunozo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15c76e72b---tabekul.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/eee4c979e3c7068c4e1825467d713e30/93233737431.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39ea1f2e7---88365322318.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/q4m728lpe5afpm3n46hn2oktb7/lopowuraviteno.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083283aefab5---zodixuvisosefotosox.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/jipewaxuxu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/lipojijov.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/vqjhh210n7nproe7sj0as3stsg/zivejonugugugumirevubilit.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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 11128 bytes
SHA-256: 76b9c2241d7bd8d30835c1a7c1cc7935f0c227c3b0a327444e0a638a822b3333
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 17492 bytes
SHA-256: 5c7956a3a883a62e545b16cea72ed171133a4818cbbc3ce74b63a4c356279547

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