Malicious PDF — malware analysis report

Static analysis result for SHA-256 450f9b98c0732cfd…

MALICIOUS

PDF

108.8 KB Created: 2021-09-07 18:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c3b4bb57527d0d47bc8c277958a920c SHA-1: 5a783fa02df215b0d1e52e39e4ba3888d098128d SHA-256: 450f9b98c0732cfde6331413b22ce3eec7cd31e95b32cf032aa0a8adb2901a58
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for phishing or malware, leveraging the 'PDF SEO Disposable Link Farm' and 'PDF Compromised CMS Upload Link Farm' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45371744c6---fozikukuse.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0uouq8tie6puuh4m06fdpla7g5/xotufidadurutadipok.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/27923441291.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b07a304c---79199097941.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/2944561824.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/8349879025.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118268fab294---bawesige.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210726_02CEAEC57B6C8587.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/roo7jcv7s44q16ipni3bn8i8ar/pisaxuvobep.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9583a994f582280c77ac2afe6da1ff2e/19252728059.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/513785361ca0f424be94a64b626b1b47/87272397956.pdfIn PDF document text
    • https://etimes.mn/uploads/files/ferajemijofefobe.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/pasifogesifeximoxuza.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/34487344267.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/oihq19d1jns72tf14u2os9ov4j/24648214384.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/25368089259.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c4430db7---ruwukijamakaxuxaxetatara.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608449668faae---16749932959.pdfIn PDF document text
    • http://asfalon.com/__files/file/fizojirawetawerubinij.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vezadusikof.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/vitexike.pdfIn PDF document text
    • https://capecoralliving.com/media/file/jisonugofepubetusanerux.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/tunozabajobur.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vufoxulusugamemapike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=polyester+fabric+dyeing+process+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 17288 bytes
SHA-256: 63e52676b3d501e5ae9ec511aebfdf6f8665832d1ecc1f9c51d63dbd9fef3b41
font_01_sfnt_off00014115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14115 11048 bytes
SHA-256: 3220be5a28215a7822149a569e55e47a042d367750ddace21dddedf87f24e028
font_02_sfnt_off00015a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A91 19204 bytes
SHA-256: 3a1d815610a561d8bb86c79aab6ca334f0850772fb2fb2358e8b9d79beacbaea
font_03_sfnt_off00018c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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