Malicious PDF — malware analysis report

Static analysis result for SHA-256 5158d9222446cd62…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 12:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff7ec2cb9a48d1808d9994bec62fdb16 SHA-1: 53db046d101263e6e728da2c21b6d34f6a0be4f3 SHA-256: 5158d9222446cd62edfa278504b372c34bfcd19222965ada0cebbb816f507fe5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on disposable hosting points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0a8ccaff---25013265275.pdf In PDF document text
    • http://melinterior.ru/userfiles/files/15761934561.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/43157483384.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/bf026067924bbc4de854941ffe01d1f9/wujof.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/58825005850.pdfIn PDF document text
    • http://mousike.it/img_ins/files/rojotefegefadudawowikamop.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/dapukulamatanejokelixoliv.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/zotamivusetiwabaguxe.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/talokedifevujirura.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab734d87253---tederufuwizumizik.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/92782052630.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/rovizijojagosomu.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/34765548503.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/kejoramapawuw.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/79321528963.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a7022c6b1---20608787472.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/78bee85a76fa9935d71b3e2875792943/43646476511.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/nusux.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/55214045912.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fmr4km3s46q28o9h9gm68co6fm/6698412728.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/58785059317.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7765b477f---27171551427.pdfIn PDF document text
    • http://gyobel.itpublic/file/zakisawuluna.pdfIn PDF document text
    • http://esistore.de/userfiles/file/67115873181.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8d12830213d5ffa3baf1d31b55ae86fe/90560780620.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4vhmk5h01ubtm20fu9898p74u2/fawagut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vascular+ultrasound+review+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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 18644 bytes
SHA-256: d1430a5775ccaf144a47ca05fc9b34e463e2a68d1c3cbfcc9fb4a15cb58fd1e5
font_01_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 10832 bytes
SHA-256: 81457b14eb85327b3b5c7d67584466ba3ffb84ea0fb6f5af0391f61b0cf75dad
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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