Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852669c66ed7b6b…

MALICIOUS

PDF

111.5 KB Created: 2021-09-08 18:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac733aec0821ac03e9c41371edcb28e9 SHA-1: 533b8fbc47b2f11a86ad6f8b3f462e9f2360b3df SHA-256: c852669c66ed7b6b2c10be75e710f976db2476dd8b7474a2cf3861413fb418a0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains multiple links to external PDFs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a phishing attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://md-servicios.com/userfiles/file/puroxunuzimuj.pdf In PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/37664285121.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/29781004987.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109050216201592.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/fofimikarexubiruvariva.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/tunududaxefawufenux.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/53305622627.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/xusaropa.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/89023675533.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/61819051072.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cd42c370---99097839423.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/41501103912.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/wopakuwir.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613405c6426da---85018752349.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gobedo.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/wuzaraxopiwetodorimeb.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161379b8bcb0d8---69486019347.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/95933209989.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/39026489785.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358c5e043c1---51160292052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=uspto+acceptable+identification+of+goods+and+services+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_off00014ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA7 11276 bytes
SHA-256: 63657c6c4d6e1b132f3ac1750e69478113b246d9165f843d2c41ea5fb8c2222d
font_01_sfnt_off000168b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B7 18016 bytes
SHA-256: c0afb2da75d7dc28bd8e846293c09a0479fd43786e50001f79c647ee8a3c0bb8
font_02_sfnt_off00019813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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