Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c1804db42b2a0e…

MALICIOUS

PDF

96.0 KB Created: 2021-08-26 04:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b48538ed6b4ef7b6b2b3e4a8b7a313c2 SHA-1: 7c948513335e4e0252e5d7de12930db3f68e2665 SHA-256: 11c1804db42b2a0ea9df36e7afc0234fc79003fb3138610fcf95e15f54bbc193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=i+want+to+see+more+pictures+of+you+in+spanish PDF link annotation
    • http://www.awakohchang.com/image/upload/File/agimurabisawixipumageli.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/85308715408.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/fodomaxipuzaf.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbc66b673---54629276614.pdfIn PDF document text
    • https://baptistfriends.org/media/15832759282.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac2c1f098---muvokajujopusamiluruluvo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///89114163192.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/merazodolazofipupo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/31e338a44e63913510bd190aab86fcb0/65318338172.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab27e2099---xudagivanenerujiri.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog//file/36759399775.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nunovi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f074aa2dea---butaninodijiwowusarake.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gafer.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/65458345008.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b9l75ltqdvia82umjvvt2egp6r/zevubades.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/vevikogexuluwolegubi.pdfIn PDF document text
    • http://inercial.es/uploads/files/dufopijerizazasefete.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec34e6af6a---gegugevasozile.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/sadfst7lsakjmkih0vrqsurj11/degawolobiximato.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/28f4169f36123ab8c2143045e32831ae/doxumowojigibonojetajomew.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/65379295626.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_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 10948 bytes
SHA-256: 5084c3b1fbbea10ae4c7fe48676db55c1c9294d4ac11d3db7bcba5f3a9e506cf
font_01_sfnt_off00012be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FA 17492 bytes
SHA-256: c223c1f6990c6717bc32f05292519f1a05274d99cc05981e53e402024d4f0886

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