Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6fa8f3af0cd165…

MALICIOUS

PDF

90.1 KB Created: 2021-07-16 02:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 227948cbdd948bc4ab909417aa696e9f SHA-1: b2ae0983601445b2f8e579db9be2e41f10a70f2a SHA-256: 9a6fa8f3af0cd165d8ddf3e4ab46a60803c0546ad54c0bdb54ea5a02003e6eac
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 or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://adance0112.com/upfile/editor/file/17496932521.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9091f188---pogojom.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606faba61d071---59804387302.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/sumawusav.pdfIn PDF document text
    • http://aven.su/userfiles/file/dilegomutewe.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9d4a174b2e7e000304a770118703456f/mozajolejabu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8avpjt223m0go3b58aip3cicfm/tamavenunube.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/gajovub.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727f92905ba---kedexuwogevolegagovumam.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/76042827709.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f8b518e6---50293772249.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5397e3f1ed---52925429237.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08b0e407a---5895283833.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/aba30b676f7e837beec6e4ceed6a7dc3/kitakupomagilosoxeporu.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/69647670820.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/lewudazuzozisaf.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tblk2v3qf6o5f13mnm7lbqcguf/56884917301.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210627030708.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/7662072975.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eb1bffr1loemrekt478db4cs93/97926070532.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2a0e38cfa03dbbd4cd4e43ec717eb60f/kozigovibi.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/87735125486.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///2778927860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=omsi+3+releasePDF 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_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 18228 bytes
SHA-256: a90e37eae1fc2844015b8ee04c25453fd8c5ac8a1ff6dd24f53126489a59636e
font_01_sfnt_off00012b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 10144 bytes
SHA-256: 88719eb04e3e816e6e9e861cdda7ad25b00f8c78cd791901ecc325b3a527c31a
font_02_sfnt_off00014239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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