Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbb36962e000bf8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 07:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38631551650a98799879460f27472fe3 SHA-1: 7c34be98f2b6bd95fc8b221fe0353e3ceeb328ea SHA-256: 0fbb36962e000bf8cbd526628f4821433d803be922222323abe9a6970088458e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://grandplaza.bg/uploads/assets/file/jaxakis.pdf In PDF document text
    • https://digireg.dk/upload/werujopikinufarore.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be0d36baa62639c2ece5a21e505d4b44/setonafixore.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/zonexogoxivivodenapotaxu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f9fb78ec795134fca40b8f2a21d6bf91/18864790179.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/919370a5ae85c5b41c47cfce9ed002af/vafezabiviti.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87822622067.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/jetipoxofazifi.pdfIn PDF document text
    • https://medius.sk/userfiles/file/9593798316.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06dbe93462---sonutago.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/32430388360.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/53155088314.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/rerugunali.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/75278567199.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a62902f2e05---29757784929.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/54309120298.pdfIn PDF document text
    • http://altinay-law.com/images/file/40078408055.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8881d8d283---witidepinusorawofusafi.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d05d52fe64346bf36875a6114aafb82f/vafipit.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-28/20210628201303631152.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/bacc9575966bbf5e63eda1738dc6cfb4/mogisalemazojazekamejo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bee71d33635---69633032622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gas+cycle+refrigerationPDF 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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10664 bytes
SHA-256: bf7219d2bbf6cf90346a4901e5ff481630c1c2615b8831fb35dea788de430878
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17096 bytes
SHA-256: 216d941edfe81497a31971d9d06da1ac693610192bd9f4b3642059cd8e63be6d
font_02_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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