Malicious PDF — malware analysis report

Static analysis result for SHA-256 e387c671202fc5e6…

MALICIOUS

PDF

70.1 KB Created: 2021-07-04 20:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 047694c29b3ffb2c0afcfa26f347ef28 SHA-1: 0f15a985d75f8a240134da4a54486b428c0b42a0 SHA-256: e387c671202fc5e632bed93a57dd0c09295365aa7755f0e188dfa27b41acc481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a lure document designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d13c46cfa---pelibeva.pdf In PDF document text
    • http://pivotal-technologies.com/userfiles/file/4898793787.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/pewivowo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff4e5c422---48107915900.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0aa5160b---weren.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tk1rt1sj7tpd3pjk015bdmi2kn/93267262892.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/xenabiroto.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/90415070477.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608183dd62f26---pinepibufirepapuvimufe.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/2427689510.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/74713904013.pdfIn PDF document text
    • https://digireg.dk/upload/vurofenagupig.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/xoluwodepux.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b5cb26709f33171ad529986a3b15dde6/42873664568.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ieepls9qk57bir3bu7bnfj5qja/75912921897.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1bd0bc13---31096361459.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/fanitamilixowigaxada.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lo8bu13f0gtp36s0gdbcrja7mb/56007363868.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf80c0e7c---lazevuxaturolokox.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d28d7a0e0c0db3d942e645e35cfd1ead/35499639642.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/lilipabivazo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/79872736367.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160783c164eb36---27073145149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=consonant+sounds+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 15116 bytes
SHA-256: 2e748f76e4961fee48a0e58ecb497b21876a7924c7030c2e75e4ab04fd38b44f
font_02_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 10516 bytes
SHA-256: 6950128dca24da4fe7261403ee0298c08a2e89c98646874bde5f37e99dad230e

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