Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27cb1065ad51a72…

MALICIOUS

PDF

82.3 KB Created: 2021-10-06 10:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: bba1c0ec9b2e4bc089dec039f6c6081a SHA-1: cfca62b986e50f9f1a55f00afdb10c77f2c812f3 SHA-256: e27cb1065ad51a72a453007a3ea7b189020cda9cfdc1c5713b232545786b7572
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a common technique for executing malicious code. This script likely redirects the user to one of the numerous external URLs found within the document, which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pesonabali.dswip.com/ci/userfiles/files/27794375903.pdf In PDF document text
    • https://pecintajp.com/contents/files/35397759172.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/21122617684.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/chk3rp4a56u65ts3tiruc6hs5q/jagakilatekezene.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161596f1c80d9b---31907568231.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/728c3abad51f56643a851de8c8db6ac6/35913407213.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/80721893407.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ef1f29b6b7ffa9702c18bafe84c463a2/sagilafokegilovunevifab.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/81498003598.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/gitubasero.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/lekanalabixexavovu.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16329097353352.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/bifukuxonovisiju.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/95574733035.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615409aac8a41---11661685583.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/43665291005.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/md23hjvstmg4uk26lg23bb1kl9/71690880373.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/suvewimuzif.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/1631587161.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/1847712357.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2a2c800995bc2ac0495976854c59366c/53752335158.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/29446401336.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b30d64bd3dd67cab4411a75573987b49/56633817531.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/36639977531.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/xovojigewuzuwuwutesameje.pdfIn PDF document text
    • https://ags-car.com/upload/files/talixazo.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/vaxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+positive+word+that+starts+with+bPDF 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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 18436 bytes
SHA-256: c7b71cb3b3e9e09778875b487064a93cff68677f86a96568639ead3e10aae9b1
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 10612 bytes
SHA-256: 9c76e721586412c9a6d2faea333e423a7f7b35974698a12986bebb146f8a0176