Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38c7d47fb0c42a7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 12:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ef7a09aff33cca9ae2b3069b15ff4fd SHA-1: 1f0f7c10d3c8f1baf5b4d8917a35875e9674ce96 SHA-256: d38c7d47fb0c42a762989166b5dcfc202a2a89f547088e080b2b25255b7391f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The presence of invoice-related language further suggests a phishing lure. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/gopenuxijixudozezaxolas.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9f9a864a---gexowilegireniwerem.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160719adde897d---79296440544.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9af2e4cbb317aff11b218ea038d3e8b5/detabiwonami.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ba8bea36---28528317162.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/29647875437.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/detofotufetaxiba.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4a52a32a9aa00b90ffcc913bb1a7f9f1/dafonajedopapimevuk.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/77830008076.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905105128.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kfu7mqlt9raprtlbcclqvklou7/sinisakajixobizogivoji.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/75883040877.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/xedoxosetej.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/82562295885.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xopuropakifuzanafomev.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d76494f12e0853a4132c2e3c7a25f3d7/54976252297.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://movietek.vn/hinh-anh/files/lebugomuzoli.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/22395307688.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/j5m27ds613vpicaqe3i7dt8hoh/60510412644.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/konuxopubuvuwe.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1f8821d7---zogopusexapibuxunoxugalem.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9fb4a72a---14675639338.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/927e8d81be8456db992b51442e8098dd/31938680250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=anemia+por+deficiencia+de+vitamina+b12+tratamiento+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 16348 bytes
SHA-256: a8f486aad5bdbd683b3e49b8e66b172ad839700e2a2caac03c0d996ce4e6738b
font_01_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10924 bytes
SHA-256: 3bb684e4ff00e4456d255d705e7595a6c413d7a817f0d1e7371f0235a5ed78d2

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