Malicious PDF — malware analysis report

Static analysis result for SHA-256 d864ad7378de5bd8…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 09:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5c8834d44dca13e3a96d81ea6db4813 SHA-1: 42770c162106563b7b08be05272099c7080f8033 SHA-256: d864ad7378de5bd8ff74a62ffd17ec62cdbeb98dc667d20c7fbf11eb38247309
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts to trick the user into installing malicious software by posing as a required browser update or extension. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, likely serving as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://queure.ru/uplcv?utm_term=computer+graphics+textbook+pdf+free+download PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8ef87981d7e2442d046fc7b994b06870/83907571652.pdfIn PDF document text
    • http://ps173queens.com/clients/10779/File/borapiwidaverujike.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/12922494825.pdfIn PDF document text
    • https://uangraja.com/contents/files/riduturonanalifox.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/98371768747.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4f1d827c---92348551537.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/54890336724.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/44847641804.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160768929798ec---kojipituteporoxixufakufix.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/46112300230.pdfIn PDF document text
    • https://irantruck.ir/data/file/janomejo.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/fobepexilakibemeximuzew.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210718095249704.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4b598fbdd47068ffba2c82199d8dfb02/876988426.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/likurerijosifotevutesis.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/85125587041.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97afbc7791---43990695429.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20442ad96---2097594839.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b2c6002b---jufuxedebe.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/tutaponen.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/3387100374.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/43083654642.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2711c5f218---busamiweref.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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 11620 bytes
SHA-256: 3aeb920c11e90ec1d13786a2d6aeb119ab65fc4bc8548959df412b9b9c8f1a0d
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16840 bytes
SHA-256: b360630962de14a3a65d1d67d53729a3eb8f600817cf5b1eeed60e30b6bb9254

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