Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f00fe5e3049b4…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 04:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55d12e0e818de4ed704f68567f225a26 SHA-1: 8942d743d688f4af0729c5294883ffb338528fb8 SHA-256: b40f00fe5e3049b4cd12be5b4c1e38e91fb08eeb35827196ba4aa091cab33a65
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kxqcgs.com/filespath/files/20210820091457.pdf In PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/23451532007.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/nubolutenuwupu.pdfIn PDF document text
    • https://korankertas.com/contents/files/89330122309.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/75877096210.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb2f2d6037---78876970074.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/7a71bdfe2f3a183e8238c12eadc9463e/88454485983.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mvuqi8a7ogkkbgpualpqujd3g6/28341809138.pdfIn PDF document text
    • http://jar-ted.pl/file/50443882206.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/2938566838.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160828bb279826---vupodoxofi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/66497603497.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607829521c045---benoruwozu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20412022b---28540262996.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/115097752.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/juboxizom.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/keranagofosazisitovugoz.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36979d670c---14228980676.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e5d4078a4---pijazixexalurezopowamusi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/47315956238.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/riwobifimojitibijopevobi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201959287483.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4d3bac65---wulorifewumunonad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cranial+sacral+therapyPDF 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_off0000c0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 17168 bytes
SHA-256: f4e9e63b353a7eec6e9ced881db4fab61df7be43cf084660803eb1542f7bc585
font_02_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 10496 bytes
SHA-256: 963c91259e2136af660a131c385170941e66361eba353fbb0badaa325cdff449

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