Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8d167ac195a71b…

MALICIOUS

PDF

95.0 KB Created: 2021-06-26 00:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 289e437d8e0f1ad54037ead0b26b638c SHA-1: 57b924caaf203d323e2ed9aab8d2fc4582ddc942 SHA-256: ff8d167ac195a71ba1ecaf7aaf619faa15d96031484ed9414425759ac23c0b81
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud document lure, aiming to trick users into clicking on embedded links. Several heuristics indicate this is a link farm hosted on compromised WordPress sites, likely serving as a distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951fcf1f60c---65099765699.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d579f47a623---pijatakaga.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/11drs2fngkpnf479s4u8sfhlgk/livok.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3917807b---93433713022.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0416f2b630---wavivutubezapenasedeviwux.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/btofrlkpb7j8ub4q1mgftdjvkj/vadatalogediwanevufa.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da249d9619---kasuseledasegob.pdf
    • https://advik.net/userfiles/file/posejadikanubibikama.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f886ab7cb6---dewazisaratisikotoxok.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5248157cf---90920560775.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160742d4c8b918---35923034745.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6d3b10e3---26116075766.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c0eb6a2d---wepakituj.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/muxulepumexuwewijoligoj.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160707aed63a2e---zamojid.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071a20a5ab4c---42791795349.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee368141a---41250946061.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8414f47ea6d3cc69342db88b71e78495/zilavazotaxarixo.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf3987a35---35416738465.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/94162556317.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=going+paperless+in+government+departments+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011044.bin
dfa5a20113d04b658f7c947ed7b10f23a63434f921ee40e03ee103893f4a3923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 10948 bytes
font_01_sfnt_off00012982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
font_02_sfnt_off00014194.bin
da743fcd5b8d769e24a69f17f8adacc5169aa7f2651b9e88254a0a69479f9eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14194 17296 bytes

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