Malicious PDF — malware analysis report

Static analysis result for SHA-256 238784bf0882155b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 20:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a53750f21027d0ee83db6d270c449711 SHA-1: cba003c40ab6ae5175b03bc4d4e4c0aec65c01a3 SHA-256: 238784bf0882155b77d9f2c78a83481873093346ec0e5befbf19d976dc5e284b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phishing content. The presence of multiple external URIs and a link farm heuristic strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://kaitosushisb.com/uploads/files/surokiwivokuwulurejom.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0ca221eab3dcff1b13ac92d2635ae12b/88196924251.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096847c5da63---bujodomivotelewusar.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc698bedb8---32418547072.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/563c2f0db9af18cb609ba5314a99d8f0/vasilijuxelekires.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/fivexize.pdfIn PDF document text
    • https://kham.vn/userfiles/file/maxidukane.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/cscabt496t09ncubm56161oj62/7991878752.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/samaxebuxirujukulano.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac1eb68b3---66949403994.pdfIn PDF document text
    • http://0930actress.com/files/files/27795595716.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/fetaxifoluxorag.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2fe1b2cf58f52d0e35337f14fb38501f/bubogulozerusudesenuviwom.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c51fe35912---70777623740.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/600d74d8a00987000e710aef2625e0f3/vizojezovesavobej.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/zotawavumuzuxa.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a4a09596---97138263025.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be73758b207---rumukezubegoterogetudogo.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16080a11ba14a0---jujazem.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/xujinijewagofojajes.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/62017840965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=clash+of+clans+base+th9+defensePDF 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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 10720 bytes
SHA-256: 3174d254d3b414f94ba9e8b5f20d1f1b483311f60fc02934de9fe532bbc76560
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 17248 bytes
SHA-256: 9fe8dd19321cc8327137c469dfe0e2cb7d0cc52ead84bea01cf1a949c75f469f
font_02_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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