Malicious PDF — malware analysis report

Static analysis result for SHA-256 f218db5ee16fca2e…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 07:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e6192015c7623c30cfd82413258ea3b8 SHA-1: 8451a8733b464ab95b5509bed3b4a9159ccbf4bc SHA-256: f218db5ee16fca2e3d35a3b47a5a9fb210fd2e4dfd9a8c443a2fe7e36190b068
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content or phishing pages. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7dec32c47---nagedezanep.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68e3a123e1---sigubudujobuboxurafuxedur.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/34831742987.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/73c23bbc45a12c417dc3fa557d39e784/retegil.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/5217604748.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/505cde862a4902d6ef7c25b8754ec976/jufapolewirofidivexivukup.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/49179144325.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/72180677254.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/dipezekol.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/741d96fa7c25d56e05f5b31347b0b2ad/11972799856.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071401708851---86288268511.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/21573595116.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rl1rs2bsp090rp1pohf1f17le3/10261014461.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/e93kiphk6eoo284e9t3tk8j6l9/98489115477.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/gotitagu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee2a5e3a7---rokipazulopi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9vsl6s85fu7acp576fvgvb97l5/rapinogazelebekawe.pdfIn PDF document text
    • http://camonetinternational.com/files/file/94015952227.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4cf5b25a51b039bd22c6412e2812ed35/fijorelajazabo.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/88efdf53ae31a3824aa2f2aea7731216/saforulevuzevonamepajesi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d947fe14---61356937316.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2408525b8---fipexodoweruweparix.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b5db0003---romofatuvimatul.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e20ec660---83700955669.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9018d938f---97824944080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+1+chicken+shooterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fbb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBB4 20076 bytes
SHA-256: 64716263b028b214d631494adb5b5e75375b40b49988359276582086626a0ef7
font_00_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 18200 bytes
SHA-256: 0d9e38a83d8b1fdb299dbcd682e6aebe805f8cd61c9ae4f0cd3f144221a7bab9
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E8 10384 bytes
SHA-256: 26022bb9c75f1ec339aa44c58bc5e1ca6b0790d8db15d35c9f89b80e66186ff4

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