Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ca2137b98904a4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 19:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a4f95d685c50f9be6a8be21339180d8f SHA-1: b7197b8170cee0445c0278e1187f08d6807e5e5f SHA-256: c0ca2137b98904a40ed982fb6feacd582489f9183202d94b4944609499373828
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised WordPress installations used for hosting further malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=regimento+escolar+pdf PDF link annotation
    • https://lecormier-menuiserie.com/www/upload/files/vorifupomujadutokufi.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vemulepojekoge.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfdde53d06---duvazolimuj.pdfPDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1789fa34---18939992115.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2775056428---80848308994.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/dubonisulomedi.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/lejizejuxegedoxara.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/gorerilewanolalizutulik.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/sufobe.pdfIn PDF document text
    • https://stadion-nsk.ru/ckfinder/userfiles/files/56031152644.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc79e47f0---fiwupujofulapemijelav.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/dovesoderijini.pdfIn PDF document text
    • http://labonscafe.com/userfiles/supobunigagulatedimomufom.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a487e2cdf83---53871718506.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/tisezefujixu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/siwunajasafowagejerol.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/64646997872.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a8a0vl8eb4cqoeljanokkopmhf/2173449350.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/lisoverumet.pdfIn PDF document text
    • http://1carl.com/userfiles/file/welononinofupije.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/84049268068.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jr0tjdo3qj5893c0mn9c8lvf4k/wubatam.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/kulageweginitipinakul.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_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 11008 bytes
SHA-256: 3b245f213481a088919999d88abe75e0caaee329e72ed518dfa6cf1fb6bf1e58
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 17836 bytes
SHA-256: 828dbb2ead85b7492f6c9e237a275b02a605e28bf9182e8008c8b1a5977fa2de

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