Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ff394262b1f3c3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 20:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b1f92033cb46b1876ac0bfabe2a78f3 SHA-1: 074e7bdd6eb3ae7911015843afb0d3093bedf375 SHA-256: c2ff394262b1f3c3b2997718ad59cbb1f6c7151fe4388ac728a24f41079fc9d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16090939c149b1---21633933590.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/6dbd936f07782fb217549fdb2602cb77/febokadetepujuzusuxex.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/89321727520.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/13106857892.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa65b205a3---piveruwidor.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f84a034c12967618c7cf37f08099ce37/nusalavus.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/55a31dedabec4ba8fc11f146aab66ad7/25532775563.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/c6hrm778bdn3jln2r74qrbots6/gisirutofemil.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40385407341.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gipakubatizumadop.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b1f4001d818206a20d4614eaed41d3ac/36560014656.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/kewurijim.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607914a0e3379---rufupapopade.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/xawibobarup.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/16165502328.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/2904288389.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/94179926449.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/27980741289.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zeninalizepexujug.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2033a853---58911692161.pdfIn PDF document text
    • http://asid.rw/userfiles/file/wugimedagigazixa.pdfIn PDF document text
    • https://ancoraeducacion.com/images/21219346900.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/xadabojebejar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=keynote+upper+intermediate+split+a+pdfPDF 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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 21668 bytes
SHA-256: 3d79d54d6aad7810b98766e599b7ce409d4844c0f15d3f06e210b0dc48bb741c
font_01_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 10864 bytes
SHA-256: a780310becea566086be783eae864ab882943062a95f59611b51eb2499bceb5f
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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