Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9976b440770aed2…

MALICIOUS

PDF

88.6 KB Created: 2021-07-26 16:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c562b7ca829504438ddfd9bef63b189e SHA-1: 71cf63528bc5ca4bc170926d524fb5f383873bf4 SHA-256: d9976b440770aed2e6f41e97430c3415a7eece2e3eca06e547b44a706b4326de
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://alexandrapanayotou.com/web/images/static/file/kefomesuvorevimutodutero.pdf In PDF document text
    • http://aliglobshop.com/userfiles/file/gisujafob.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/41030708313.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62e9e52714---xaregarilejoz.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608803679f755---lubatev.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd617910d---22907597184.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d1922d602---wijuvesamumixujibunagog.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098b83f25b1f---27687398447.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/18115342231.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca42b0bdc4---21591388170.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/59209224672.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bf4b13088d54f8554c336969a4e303fd/wabapolunoro.pdfIn PDF document text
    • https://ms01bet.net/contents//files/puzerodukamixezesas.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wisupo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/mudinivuvijogixigoxirit.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/darivavemenetago.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835c099851f---bevifusabubobaxim.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/vofok.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823c9e3b860---97243103698.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/58154140461.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/poxip.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/60723512598.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084679532c32---nomito.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210702_E45C4049913E99CA.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfe7ed913---63125961700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=grow+your+own+strawberries+kit+instructionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 17024 bytes
SHA-256: d732960e2328bae422cf47a947695dafa51be0d8c9eb7480ab35de0933e9eb59
font_02_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 10748 bytes
SHA-256: 2ab33441c10e8a629d5c55b3e5a90f2f6340eda05ae03e71f857d4da0cf8ee08
font_03_sfnt_off000133d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 16504 bytes
SHA-256: 5984c4d1a479814a499637c8dd813ce79732e0954423be119908b153536a0d62
font_04_sfnt_off00014a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 1812 bytes
SHA-256: 8c28d97cf62a097232635e4b8e87fcc3f43318a36e04f830f8fd0392aec3f02f

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