Malicious PDF — malware analysis report

Static analysis result for SHA-256 420e1786ec0cf007…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 276c6306cf6f902d6de56a1282373812 SHA-1: 8be5c02e7ebf7a593886a50149a27a128be8509d SHA-256: 420e1786ec0cf00735afd5ccbef1bf5fc52b4abae0f1bb154191b2630bbc8ba7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites, likely intended to manipulate search engine rankings or serve malicious content. The presence of these links suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=principles+%26+practice+of+assisted+reproductive+technology+pdf PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bc137e373---belorilulatojurar.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/622b5586dfc20c8896699d5c548039d4/70325860035.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2f4d13873---88859502490.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb6a34b46---dikifinapagud.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7lrq466fvfisue025lt37h720t/74417946478.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/37977721004.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/78991774920.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/tidowitodikab.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f2d7d8e1---nemowogufazefizidevibigev.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/45601022358.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/zutawebuw.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e40fea9fe24---12119001743.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c6170938f2247135e820f3aa91066fc1/48542716551.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc100ca49---woxupaniral.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/63608ef5d55a0ff2c9c92a45d82f6a37/36108145675.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/29789764693.pdfIn PDF document text
    • http://modern-pro.ru/files/file/71238229401.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/98201724540.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/wiwuko.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098160b45a6e---zasolajanopolado.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-13/images/files/98759896887.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735dc402010---76233877377.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/debumawago.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077207465c43---54860704850.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_off0000bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 15672 bytes
SHA-256: c765c1f001958d2099606bbdcff359579284245242796997b29a16df6622afeb
font_02_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 9984 bytes
SHA-256: 880a3bfaa717aafc9fdc9ef765ff16afdeb5ace4ecc84980d6f8769e1e7e540b

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