Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ee3b5ff3a43232…

MALICIOUS

PDF

150.0 KB Created: 2021-07-15 10:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: caa28e8974227aaf56a23a89aef5af59 SHA-1: 9bdbda17b52801c285bb5bcaf1ee2cad22c727d8 SHA-256: 21ee3b5ff3a4323258275a5745885599dfb4697da58018a5aa49adbfd3b4925f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests it's designed to redirect users to malicious content or facilitate further infection. The URLs extracted are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=watching+you+kiss+her+oh+oh+oh+lyrics PDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/47d6cbd4a89e72893e7f3e80a11689d4/25893542958.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/54863477750.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c909a6546e61594e9b855837d5ab6b90/fanatiribulanad.pdfIn PDF document text
    • http://plncse.hu/php_data/file/38905685398.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nomijed.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/mafepugozavenevitepo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608689b042101---zamodudimumagevotize.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/torofaligekum.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/9448317101.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9c336bcbe42a05bb97398d03171237cf/74604506483.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/31035075691.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3d8397fcfb2354ef8284d4747a36cc26/buvugeroxipu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc258eb7ed---bamakerizuwosikaxelovox.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acef39dc4e---69357702603.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/la2hvgbgaebl4vv4bd4dc69s7m/75484933428.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tukanedumowefodenirezabem.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/99883493599.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609136aea9bc4---19056295160.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5bcb5b587f6832ead8b5e9644e6011d0/95797345940.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e14148e7---29619213733.pdfIn PDF document text
    • https://stvorki.ru/files/file/wekujaro.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/gipaxebekenizumo.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/xarewetekuxazezekiwowek.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091303c98b36---pusakapokes.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2c88dda7---11668475643.pdfIn PDF document text
    • http://novichiha.ru/pic/file/64453616892.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/88649e93d493d9f2f121bc2a1be9610f/75323169131.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070120252573499.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_off0001e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4D9 20420 bytes
SHA-256: 6ba6768d0d591ee45858326a7f62f836695a5a824e0a4d4b9b36b11b254f8495
font_01_sfnt_off000218ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218BA 10808 bytes
SHA-256: 6a30aa9ca23df24bc93014086901b32c485c00ddd5f5b1bfc63cca8aa6d10957
font_02_sfnt_off000231b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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