Malicious PDF — malware analysis report

Static analysis result for SHA-256 9144d1e9940b952e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4b7be4f47814fcc36759d5718004dd6 SHA-1: db9843612b278a91b9eaadf4ab99e53d69c9b11d SHA-256: 9144d1e9940b952e38b76a6a910d2b624b8a43248a6280db6c10c35f46cfff26
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://animalscipublisher.com/files/upfiles/file/rijimumajabe.pdf In PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/94254792755.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8964561916---kubodatogimaposikoxexif.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/dunik.pdfIn PDF document text
    • http://apcmagon.com/userfiles/sikipulesevabaxozukutul.pdfIn PDF document text
    • https://pecsikult.hu/files/file/86711306078.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/wevipitusewazale.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/zataxenuneteva.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091301a00b7a---37559049937.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vi3backvim7up8hkip7sr7b5op/kolujatebiripolovagag.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/muxegikaxubadabisetobolu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87de94bf---73221375733.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/parol.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1ac8772a81d57744a7c8f6fd2d482288/59915433953.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/28730841850.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160edaef392a32---lovemulovigokolunibig.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d435f3eb85c---japosagoxisuxive.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/gilotonafojit.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/milisawu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112a5c4f10ae---rikedarakutori.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974adb2bcf---22125720910.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/82806979329.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/95327858629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=world+environment+day+celebration+report+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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 18112 bytes
SHA-256: 9f5c52494f02e0d93bb40dc63c429855b42f924776b2ae50a9b480a3b088ac6b
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 10924 bytes
SHA-256: 4c51557220fffb3810b7673d136dd1eecfe8127e00fd2846016c0c120781d8b2

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