Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cf7c74d431e8be…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 11:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b9efbee76dea2bee347d1160988a5ae SHA-1: ab4409de1ab722175d0fb3451c9ebd7a5cedd630 SHA-256: d8cf7c74d431e8bee2e7326fde18cbd7d0327be447f5e1b9d529ba520bf89293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://catamma.ru/uplcv?utm_term=best+free+streaming+sites+for+android PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161373bddcc8b8---vikebiburemevove.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/83241919279.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/tanajopudurujamujedawaji.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/93748523694.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/pozugolulez.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/powisilepomu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e25fe5bffe---5418275387.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69bfd4a84---jafuva.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gufamabidi.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vajedokikosisorufojexosa.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/66782087344.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210917230500.pdfIn PDF document text
    • http://ajambary.com/userfiles/file/72100740225.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f01bdd3dd---18451500111.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/kozerikujitoloxazas.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/24632467953.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/21060560991.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14ea3f31e---11940690013.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wokaruvijamegojorabiv.pdfIn PDF document text
    • https://manenshop.com/upload/files/50442976178.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/kuziku.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/48646061606.pdfIn PDF document text
    • https://shidoremicrosys.com/media/visosabokonezusekix.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2db97d760---31944325533.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 17372 bytes
SHA-256: 346dda71913ae9eb0487425c1be088488f073688bf62051efedd8a7c5c5c3fad
font_01_sfnt_off00010e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E84 10704 bytes
SHA-256: dc8da98015df6dd8032654b5c6053dfaa2e1754a2f7e210f7109f460e021cf06
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.