Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd156eba384dd73…

MALICIOUS

PDF

86.7 KB Created: 2021-08-07 02:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b94d7e86c93406932d51e1d919578221 SHA-1: 80ffe774390131a786a3691316d57677f9af0568 SHA-256: fcd156eba384dd733e32baeb2b542c6800901df8931e4f6416f471b1d2f69439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kv9pqc1pdon9nc67594ndqsso4/83901614258.pdf In PDF document text
    • https://nocenzura.space/web/img/podborky/files/gugigiwaga.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/bezifa.pdfIn PDF document text
    • http://zerosquareonline.com/file/zetomexadet.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161034ab20bc88---34174913743.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1j4e9gd9hh49ti1ga260kcg7h1/danuravulosuriwimisi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/41d1182272c4fe0b709f57cf5171e520/rizurami.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/oron7m11l01e9td7auj36alrs0/nuxexogesisevujeg.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/5513445035.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/23956236105.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/17407646876.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c09546cba---xexezonefosaxobu.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/buvev.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df70e039900---kitepabutofabewegoxese.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/51584727523.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f256228fa---birus.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/8235585932.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/44999109920.pdfIn PDF document text
    • https://raljob.com/userfiles/file/jomamuwobu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607960610ed83---jadax.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/vibod.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd528be26---77747256902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=electrical+engineering+drawing+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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 17188 bytes
SHA-256: 1988a0fb2f07d7a89847944b90446bda410185647f394e2daeac71327c86b120
font_02_sfnt_off0001320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 10576 bytes
SHA-256: ff7c471b78570de12f931bd870d1966f8f239803bf2597fd98d97b0b69fc9e1e

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