Malicious PDF — malware analysis report

Static analysis result for SHA-256 807bfee733fe5a18…

MALICIOUS

PDF

75.5 KB Created: 2021-10-17 09:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 813f78a5cd51c71cfef492d1ac3ec2cf SHA-1: 2215b32eb67db87dcbe0de22b2dc0244d09a2a99 SHA-256: 807bfee733fe5a1851a65bab3519e3457c8a62aa4ebc503ba006a954ec63ef4c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://grdr.org/paidel/ckfinder/userfiles/files/bifafufunodefipe.pdf In PDF document text
    • https://proia.bg/userfiles/file/xipolugifoliwexu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ocme9ae5fal3pcltodmn8dpgoc/82422233701.pdfIn PDF document text
    • http://africahistory.net/africahistory/upload/files/31723665715.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161636def8d2c3---15172511227.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614410c66b7aa---2556721173.pdfIn PDF document text
    • https://pr-dienst.ch/file/wijew.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614d85a82d7d7---dulozikejesem.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/64409000216.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/bosoragukefibobewa.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/movitupaseto.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/73181447388.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/78001677384.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/24926890227.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16132103ebf4f2---27064282468.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091216301022.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20211004174523.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/vatofixokagutitoguderu.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/vosoduwedego.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/77439706890.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4b535b4a---lekinatifomujerurugakuko.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/10707583615.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202110030507518171.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/62489469234.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=importance+of+literature+review+essayPDF 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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10960 bytes
SHA-256: 0892e3e02b6118fbcab6fc84fbdc0dd10b05235e4e65083dcd10d2bafc03aede
font_02_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 16644 bytes
SHA-256: 6e4a23b3db5d5d003985bba41bc4a879938c4998cea7c0a95266a5da3a82a91c