Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d0003f645dc16f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 19:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d73357aaab093a28a1ea6173681a5b8 SHA-1: 5efb4cb405840b8d814bcbe559f276f25bae21e3 SHA-256: 78d0003f645dc16ff821f42b13e1103e2576a27da10327f17996aa2fe6fc51c6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The document's structure suggests it's an image-based lure designed to trick users into clicking through to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ediliziaunoaventi.com/userfiles/files/82756188406.pdf In PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/vikuwagili.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/3606415528.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/parivasedevabuvagapi.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/23355438117.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/45733125399.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb09a13c91---difasi.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/kiguvawajerufosaserurosu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/263l0579uv57ncqsaotvk7ipr6/werisuxov.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fupuziv.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/2250189713.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210901051727_c2VuaXJp.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/gelirogezuteti.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614410604e114---80826149851.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/41974440508.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/ropularerapubokimo.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/62308897974.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/lupaxumefisem.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/nowugivefatu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904033631871.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/ninasuw.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/16385819628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=happy+tree+friends+deadeye+derby+descargar+androidPDF 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_off0000afa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA5 14476 bytes
SHA-256: c860426b38f47c63d86ad530b800c07441824af25ef18e87da43110284c65cf7
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 10996 bytes
SHA-256: 836804f3bd752b3ceed375955d19d38ae0e12e978d66f0f32a4a98fce406b971
font_02_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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