Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a2c40fd758d1dd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-02 21:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45f23db6ba65b8a40a902877f8a20ffd SHA-1: 6e7d365a78ea67d6051fb75d3436912b9f9e720b SHA-256: f6a2c40fd758d1dd73b3981ea7fb8b05e9513007011a85ec0874f05fb6b45c90
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to potentially malicious external sites via these links.

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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/21b3036ab5d70240c1bcdab50caf3e7f/lajixovetomap.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089f963d0c74---84247547397.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/91859689728.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/nizogupuwesuvosivamoba.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/39546778235.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/28258291577.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612507f582986---3077017037.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/jerolobojozazuzinanele.pdfIn PDF document text
    • http://htwy.com/upload/file/vozafovidifasedim.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc968d773---nuxoma.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/824caff570620f877c2190e4a99ff533/89877274426.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16229486043636.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6bc3e2c7---ralarixubemuwazejuv.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/97926529753.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/30513765786.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/16044027635.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8f8bcbf0---jejilaganaretunagevak.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061718325473499.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/91948600213.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27d095165b3cb123d2748f3f6d3eaf9b/badowogevujuzakakotu.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/nisopunazagibafofadepuru.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/bc6fe3ab1c22d4e9d754921dfe3a9c68/zelukad.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/62876872491.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/81748109991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nutritional+value+of+eggs+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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 10816 bytes
SHA-256: 4052c7b527e30c64dd106fe46b6b1faf1f2e6be619b36c782ef3f32f3ff7b7d9
font_02_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 15064 bytes
SHA-256: d06b1efbd1fda724974474cc722d2dd10d53563f9ca2ac984183b897f872595a