Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88125e4fadd93f3…

MALICIOUS

PDF

88.7 KB Created: 2021-08-01 19:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 994849391e726f52d66ea01981f88cc1 SHA-1: f1428d9ad2e1b5f8453c57a96e4aa35252c90212 SHA-256: d88125e4fadd93f3a4f7e2350b975c4db77b506677c434c5d74cb343c7493ec9
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous links to external PDFs hosted on compromised websites. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8bc3c728e4d12096768ab160dddb9a40/18451246164.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7921a751d308011e42b66181d2caaff9/23444634470.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160839e8b69f2c---risuramojixapi.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/gosawizuvaxujojiv.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/jepuximiserixam.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/bewifonulipevaguzolir.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/belovavoputuxoto.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1755a0c62---gukil.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28bcb57f95---9169606352.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/61bbf8002ce1411984bbb463f1ecf105/95542983646.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/30661589678.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27939b19860d0845c05fe621fc814522/24263044288.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/335fc22b06bda6ea63cc07273002ebb4/21172716526.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/96601813382.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/wugikojipoxuzikunes.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/pojonokexofiluvod.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/xajirupux.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/66762078572.pdfIn PDF document text
    • https://longhoang.vn/upload/files/80178209327.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/14115382670.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/52367289858.pdfIn PDF document text
    • http://dzbnf.com/upload/file///ramixonijifetodanujuzek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=teddy+bear+sewing+patterns+free+printablesPDF 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_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16820 bytes
SHA-256: b1fc258a860f0502b95688a661f078929411095059a19d9f262d043cdd13e668
font_01_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCA 10856 bytes
SHA-256: 582f727921e614878c0be57b7db0e2c51b49de29874e32e92ed1acfd62208c2a

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