Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae9c515e4cdf605…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 01:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f38b6bf4bf52e21f9090e6f01f26cbc SHA-1: 4fa73707bb6ec3b3f93ab864352944d19ff7fb47 SHA-256: aae9c515e4cdf60507b7922936ca7c052e8fd7c8f26473c42749f545292def05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external resources, many of which are hosted on domains that appear to be compromised or used for hosting disposable files. The presence of a 'PDF link farm' heuristic and multiple URLs associated with compromised CMS uploads strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://smidgel.ru/uplcv?utm_term=descargar+pokemon+platino+para+gba+android+espa%C3%B1ol PDF link annotation
    • http://secondhandgraphics.com/usrfiles/file/gilimokazofuferusojili.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sibajuruwugafadafiv.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/35630651936.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/76251051911.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/logutefu.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/69209118970.pdfIn PDF document text
    • https://kaimano.it/file/17511135705.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613379d720446---zesuvimefoxaxudubavo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16145251b8e806---tukosowetovofutor.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924ab9e907---86544552225.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jmv4ae5n1kiqi81iuh9nv5i651/megefuw.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/69455205460.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///bedidopulexeruwepu.pdfIn PDF document text
    • https://ambalatender.com/upload/files/tigejuzojebilog.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gosadetovugosadisudoge.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/vuxisivekorerazu.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/56321563103.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/pogiwadomogosudumejikifig.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/43173171891.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd08d280d5---naxisuzinamabopipejotozar.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/99720828659.pdfIn PDF document text
    • http://progetec.org/userfiles/files/taferikej.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/somegapesotapu.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/bipebokumunabo.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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 11296 bytes
SHA-256: ada2f547c2780ce6492babadb8dc5f36b20ecaf9c6b6844afeff6e806fa18101
font_02_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 15592 bytes
SHA-256: 424ce970a806fff5364a70c44f183f645e124ec8de5cf78f9c01a7bb7a603815

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