Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e0ce5961fa01da…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 08:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e15393e533ced80d9dcdd0b59d9c7fe SHA-1: 19efa8ae7844add2abc3abe0e1a669a6b3e9504c SHA-256: a6e0ce5961fa01da4ca271d1dc848e64ea9b410057ee78090095609fbe53e0c9
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an exploitation attempt, possibly leveraging embedded JavaScript or other PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=vector+analysis+mr+spiegel PDF link annotation
    • http://ljjxmining.com/uploadfile/file///2021090211560017.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/83306343712.pdfIn PDF document text
    • https://artdecor24.pl/uploads/files/40475503253.pdfIn PDF document text
    • http://health-bridge.in/upload/file/rexiju.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/82082753950.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/26087340838.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/81153128296.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/58899868126.pdfIn PDF document text
    • https://badrivishal.com/media/19805791114.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4be909f1fdf477df1c75cdbd048904b4/71141529710.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/lixitijoxatosovamejag.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f96f0c7d0---9126515713.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xitositatixalolalavapopeb.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140379883fc2---pafuvemegazex.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/pivusetujuzepuniwes.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/ginarudamubujow.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/rolijodetitafaxumev.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/88468843039.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/jogagusutorevevoxetokanan.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/90068321974.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/85675646422.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/54780757419.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dinabavesem.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/67545958186.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_off0000bd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD52 17380 bytes
SHA-256: 52bdb395f636d81affcf92df1960105aa793e8ded674023424e412ad3be31e32
font_01_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10800 bytes
SHA-256: 42baaf996d02c4d9fc9afe8640b13eca7fea2971213610c5fcf8f0021cdc2d3d
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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