Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef93b5ab0f5cf99d…

MALICIOUS

PDF

98.3 KB Created: 2021-06-24 02:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d9745620ff9b01f56b48e07e80c67ded SHA-1: 2f6ff28dbcdb70b97f482be7fd923b657fd51fe0 SHA-256: ef93b5ab0f5cf99d91b0aeb5c76d7b7a9fc59d182c6fb4850d09667c740dc8a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing operations. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bet-balance.com/userfiles/file/17268718173.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6ecac79b---supozujepolumidamafojod.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727e66d3e0---vuvinegoremos.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160787d0c975d2---80392197929.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9ebd3a803ee10344916e63107c4b416c/14510088823.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bipob.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607368b48e212---13234219456.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/24822616321.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b72b5356---91384899531.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3aa24fdc40d07080c7556d92e25c73fa/sumubo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4d55282c---83966124414.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/77e0f009c43ed4fa6a0ab67a797b5640/zidovovo.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/vudunabake.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9d55f46a---vonujujuridemofuwogaxi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/51032532805.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1576e4aa5---kapifesifuzuzunakakiv.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/65773081696.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607463d1a1c18---wumimuwi.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=current+affairs+may+2020+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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014c0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C0E 16188 bytes
SHA-256: ccb9e75e79191e3b0f00b47f734a22c03f93b8d74ec5eaf6b64d501dafd0e24c
font_00_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 5436 bytes
SHA-256: 8c5ccb941c5483878bcb0ba4ee7323f68f2bcf4f34aba11ceee87ebde2da3218
font_01_sfnt_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 11000 bytes
SHA-256: 32de0fedfdf541b1c78aee7b225487e0d70fb1c5bb734ca69c167d0caeb158e4
font_02_sfnt_off000136bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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