Malicious PDF — malware analysis report

Static analysis result for SHA-256 3739de46f140974f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 17:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6086d38323433dfc63c1f5d95cfe6ec9 SHA-1: c7799da556b0768d5c37245682f42670729db909 SHA-256: 3739de46f140974f415855efdf4eb935702974efc7585f5e6674f5ba68725f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary intent appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pn-tech.net/userData/board/file/13109827548.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-27/20210627194436813374.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/genedurazaxigij.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee5753391---34358199526.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/5761233548.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/82144735226.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/bumago.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb19000962---28412275158.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/23d98782e5785520272afd636e867247/benaladedoduvalidotirubep.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d32507d1---79789708137.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rgo0hedlljbf840bcgab92pce4/9153423206.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/renojilidakukesugus.pdfIn PDF document text
    • http://svx.su/ffile/file/bivomufevifale.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a42f8e0bd40699aa1ab5c64c93cabaa4/15473667420.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4d9d7e2a045e166ccf51301c470f1f02/xigulukojodufegogo.pdfIn PDF document text
    • https://anfauglir.com/images/file/nekajadetexitefekotep.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607578c70086e---tujakujuvetafewajudoxog.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070807493050.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/digajafenuveniveguwam.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/xejawexesaripusoguruximaw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160fe477b83f0e---31662859712.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/mopubogamotogigarulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+can+you+plant+with+cornPDF 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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 17372 bytes
SHA-256: 8f61dd3ca267e2902391c62ee502731c9f83ce04d178421eed3bd655e315aee7
font_01_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 10464 bytes
SHA-256: 55c673046845540465295e5a154227ccec659d4b03e3e24730fa456542644f3e
font_02_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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