Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edf842474b84aa4…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 10:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 722f6796e4366be5c468ee4fd12c2caa SHA-1: 43b49582d740a62ac1dc1db4db8c3b67e2c75072 SHA-256: 5edf842474b84aa45e9dc736c8c83c02e6114a05ba341074f716cd0fcbfa225b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. This pattern suggests an attempt to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://hotellemaritime.com/hotel/upload/files/12401592232.pdf In PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/76800095244.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8535809e26---32533528219.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3179e070ecfa32a706986153bbb7b929/35834317873.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/kajibezizegowunawaxogogu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5f711a8d---larilaxet.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/xadowubuniwabizosejiz.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/xudixewogun.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/sekulemanawutul.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/65694815319.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae82991f05---ganolomurapemabujepu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rvtaumkluor4vm4trl2qbeguv7/45225723426.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/sodibulur.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/1221786812.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/67728208989.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095efc1163f4---92333485092.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/bitalenulomawadedi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161111649d921e---30230533523.pdfIn PDF document text
    • https://luminex.pl/upload/file/navafulezoworugate.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/77449354555.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/junobagazamupet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=symantec+netbackup+appliance+5220+manualPDF 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_off0000c40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40E 17744 bytes
SHA-256: 14fa66495aca7488803e940540fd4e9fc3d74f17bdf7a8695f8c992d2b841875
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 11044 bytes
SHA-256: 94b152f44239a92ce26a83872e62909de7c4523f07682d6f939fda1333360d58

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