Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f0f4d8f0370ee6…

MALICIOUS

PDF

75.2 KB Created: 2021-08-25 17:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c70b2fd590c4a02eb796e220fbe38203 SHA-1: b5fae1a5b2eb683b66ec0bd5be1dc848e32f750a SHA-256: 98f0f4d8f0370ee6084caa43b4cc7cf32640d9471b97b2dc1daf7a60cd5e9992
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a phishing or redirection attack pattern. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=madden+21+aaron+rodgers PDF link annotation
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4277e6142---limedomelutomomapowi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ctvvvtgefq2gui2or48t5ns9cl/6413909333.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/73891114047.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eea561e54---62458191549.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/zirenilotukegedotif.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/vowuwogejeninifopon.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c12cc2a8---xasofaferejadufolezobata.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3088884f2---40536955563.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897dd96421f---xewopuzug.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/ponulopovezejitetukivil.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/195949944a0ceb41be29d2b1086463ca/bozabupovajuje.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/91458938547.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cfoaisut44arv3ltsu326n0bm1/sodipugonizetumugesub.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/49251248267.pdfIn PDF document text
    • http://honda-vo.com/upload/file/vubotinilelajerubojetas.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/1f3cff0adcdcc737522192e1039e684c/30280840296.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3738aa69---79256843620.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/guzuneseguzewopup.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dfd5b287586994ec0e0520658026b7bd/2853343194.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/81397154957.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/23772368094.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210702052716866.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_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 10352 bytes
SHA-256: 28c7e3b79903000ae0646dab722678f30b162e9d82f8ca88bde7c1f3e95bf6e8
font_01_sfnt_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 16944 bytes
SHA-256: 3d3b0956b9ccade6e7cfec8e6ad7c92efb78b8385820ab53ecd70192dca70959
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1