Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9ff594b59550ed…

MALICIOUS

PDF

87.9 KB Created: 2021-07-24 21:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a741fcfc301967a58c23cf931a370e2 SHA-1: 1deab21cead595b9d8a4ebb25187c6759ce3cc53 SHA-256: 9a9ff594b59550ed8537dffa1783c968ab940afdfda65fc092f04c8ee5a9047f
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains a link farm pointing to numerous PDF files hosted on compromised websites, likely serving as a distribution point for malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m8bludnocpv3s71imbapvihvd2/31993578956.pdf In PDF document text
    • https://fallahi-sch.com/userfiles/file/loneg.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6fa9bd62---57526248204.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90987cee9---nevupe.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/58682552604.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcdd55e3b---5404974404.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/gebulijaxisazaxuw.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f0e7c536---67302811831.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c20f3ad0---lenazusexifalowavelatotez.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fowunigomasob.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bbe8ql30tlmo31181b6a5438d2/tovabu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b947c22a82---nijavasomababa.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/22329612224.pdfIn PDF document text
    • http://landpas.pl/upload/file/kiridaragexejesetavifusa.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4927b571---79186250172.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ac54e529---19675148763.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1dcb5913991d83e9ce8d563eb19813cb/54904146850.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d761e573---15391094810.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/04daf8f3af22bfe280fcd2503d321925/63374948742.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///31766081216.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2kk6bsj6efuufpace3k8b4b6q5/rubiraduvarezozivi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ec67d8404e62152b6912e687281fa5b1/92822667842.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fc294aef391d64ce64807c0420bb19f7/20279341219.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2v4japsacd072gq2ks7gdse0e3/nemufomunosov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+create+a+shared+google+drive+folderPDF 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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16672 bytes
SHA-256: bd4b20ba9598d388b0877ed616172ac2383fee1ee9ffa73a7bf23b17a93c8223
font_01_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 10796 bytes
SHA-256: ad5b868ef1bfb3acfdda5d4404b463b86e843ddd037bce4f1b19d68170706aa1
font_02_sfnt_off000138b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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