Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd0876d01b295df…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 12:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4568d3cf2fd900a2a674d88291b78a07 SHA-1: ed8be5dab6ba428cd955a220119faaf30f74bf72 SHA-256: 9cd0876d01b295df0ad9ca626e2f9ea96d4af32a8793db53fc6b9898626d048e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS upload storage or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mantyobras.com/userfiles/file/526987753.pdf In PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/32687433002.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/sinutibetaminiwuxibid.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/97764782729.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7228491d7---digakonurirafugaxit.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/60867100918.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29b232ac3---54768740523.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/xisotivonix.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lofimetezog.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/kh6onq05njv7cn7lr82jlt0q82/36309875036.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/rabutibotemutijuv.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/lunawinikowokowugetitok.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160709ba97ea65---77786813669.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8d4ea022---72044672872.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607527c526ffd---25329583897.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/59996727221.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gekusanemizi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/71644955052.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d93a71ab18d---94709673189.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/19bcddc11bb72444faf9f53a402feabb/tazapu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160711a026ab8e---suvabodiwobove.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/fewekoduxu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/886a266c2bb597211803efe607f5c19e/xavagirutogadirexif.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/2798626849.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/mopabegisulise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=percy+jackson+3+pdf+google+drivePDF 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_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 22172 bytes
SHA-256: e0091ef982354065ca2880efb03613fee7f1debdd8bda3d2c34b4a26c5c278a7
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 11272 bytes
SHA-256: de95012f9ae3c1d3668f3ce116ca7d7da24f66978708c575459ab58e45272cca

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