Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84a913dc618f2b3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 19:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9111642b95d83b52a037c77136eebee2 SHA-1: 0baf7344fd42137a48e7b832d884d281b108bfa8 SHA-256: e84a913dc618f2b3bfd367e8889863aa5839c48f92cdd3d672a9b9a00b40b009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://graphicyazd.com/ckfinder/userfiles/files/tazupikunelezirukab.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e615c1ccaa---37249694959.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/napujuwibakezimadedo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/30ia1pdgaamje7u78tbj4b1q90/37617623953.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/1482610547.pdfIn PDF document text
    • https://elitediesel.com.br/ckeditor/ckfinder/userfiles/files/nizezakorusolorenagokaja.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dcd95b0d02645389cfa7973ca8180659/54524014141.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f53b3cf42---vaduzaki.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/worekalebigusugovasu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/26917176617.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/sokezorinikeludoguvovas.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/7022190526.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e1a05992f7539462e2f9b31b0a8478bf/kusomiwu.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/46569402572.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/wajelonef.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b6ff0159349d025846a05d4306cd4e6f/mosebipivusidak.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160730c031eb9b---59148618707.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071b963a4822---noxanuri.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hhm9p491pk4vp2pt140bptm506/resozaribepulun.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/86450417340.pdfIn PDF document text
    • https://jotelek.hu/files/file/nakefigagonimarewo.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/21560088040.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/89131974937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=straight+but+not+narrowPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 18364 bytes
SHA-256: 4aaa0686d60878dec9debec976683060b0de8fcdc0bc5e0c165c8280e692df41
font_01_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 10444 bytes
SHA-256: 5ff75280bf90e73c8f851e4fa8c4c4c20b3eff82b171c9c72cbb1fae15aa9659
font_02_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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