Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebcb7e4d1b293e3…

MALICIOUS

PDF

95.2 KB Created: 2021-07-30 20:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4db8ae4dc0fa2eff569d4b0097fdc72c SHA-1: cc11bff127f6b8a74c9e7d1c4aaa125c8f37e3f0 SHA-256: 1ebcb7e4d1b293e330ae08dd02fa3ce38061d69bbfce2bdb3287144c8bf063be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=download+ada+apa+dengan+cinta+2+google+drive PDF link annotation
    • https://walkandsmile.com/userfiles/file/jasesenopuzadaw.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774bd27470b---37891971026.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9b70ab7a59f2d8b89d2cc84dd8598956/sibepuladasoj.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zuvinozugexul.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foxub.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6e65aebe2---20869423107.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/gikukujurinugi.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073483a6e21a---22876441100.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3c37c1d2---62727440007.pdfIn PDF document text
    • http://allasclub.com/campannas/file/ribizu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/29630552418.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c8a10309---ruzojemavaketutifiba.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c7842bc3d49c4f155acbcf23cd9ac943/81659316568.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e544da745ab---25205447614.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094150096aab---jirudatinakuraziv.pdfIn PDF document text
    • https://coatielectronica.com/files/78922447542.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ebfa0f60---fapipagilezavupuwosusonu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ak94b7mr1lvch8h1ago5kfvm07/16875004636.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/do64p0vuekegot8at8afi1s2qo/jopebisesetobutom.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2edacd8bcf551fd5f6aba2f9adfc173c/zuderozuwolonowav.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ffp3iffbq74eisom15f3o054v4/jisuteg.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zexopefurilaviwadafuvudid.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_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 16472 bytes
SHA-256: cae85331f46806c1e5e2b7f1065067e60a7a3d5e4c629dd9b68cb0654c66bbdd
font_01_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 10796 bytes
SHA-256: 6ec5f33b84dee9f1b5d71392d0efd21b7f6dbebaf979e50bbc40f62a5bff46fa
font_02_sfnt_off000155ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1