Malicious PDF — malware analysis report

Static analysis result for SHA-256 888d5fc10bb91375…

MALICIOUS

PDF

90.8 KB Created: 2021-07-27 13:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3be0a779bd1f03e26b6ee6c8b7486d78 SHA-1: 5059a7e83ae4d15f4fe27ad38876caca82cfa2b4 SHA-256: 888d5fc10bb91375272065f4e33dab613a667db7757e524dbdc9bbe882f968ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate the document's purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609885e026d31---nipojixuve.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/409cfe92af2add4ce944609d2ba9370f/nifupoxobafulipez.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ceec346cfd370e7a55984bdd75f0559a/85219112338.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7cea46f3---48308142305.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/34lag31h0ajqvf88sg26409dml/nezokarasologa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/404004e83ffb78a849f6e8661f2e5e07/99989480471.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e085edc5c6d8bb4f3646265c645f6f88/potebimi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e905386c013d961ed02e7111969de0d5/xapupagubixolamurazapenuz.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3e834c5e80440cb5da911fa544f7b9c5/zipivemilabinekefofoz.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/fumobuvabixi.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/39642936738.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/toxatokobebatetabiv.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210727_062733.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5c2875ccb307f10c24e2a8afe46f6776/gavajezubojemexefenaxixe.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/xivevala.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a001f2287---pifafasefonowitoz.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/karunixozagipa.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lunefekakof.pdfIn PDF document text
    • http://izr.fr/files/79279797105.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6b6a6be3a87ca2f4d10816091163501d/katewewaxokujepi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160860df4d55df---gesureruvixami.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/86756142173.pdfIn PDF document text
    • http://nature-revive.org/files/file/12407221542.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/78129c7cab7efae6c8838c3ad9c8fb76/zanuzi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51c37b0f6---32734570924.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/78021214475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=flowers+for+algernon+movie+1968PDF 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_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 17160 bytes
SHA-256: 6cc90dd3cfcef0bc32aaea81af6e3d9e6ca4c79f05141c733e60fb1c2dd193e3
font_02_sfnt_off000141c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C8 11184 bytes
SHA-256: bf5f7359123be76362a8591bc82a1229ecc987716671a75879fda4a12057dfa2

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