Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9967b67a13a30c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 07:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 858f74594fdb38af562782519d51ffa0 SHA-1: 8f65e59d5e4f5156726a79000650cd95039cf9ff SHA-256: ea9967b67a13a30c0d2cca0d857e2ae0ac811b0b484d591b211bd0ef67e9dd35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple PDF link farm heuristics and embedded URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gs69go5j1shuno6sru90qtt7ml/fitepujesifiwogi.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b354691cd20---dunusegaxodil.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/79748821340.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/vubozevopinem.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/vijoj.pdfIn PDF document text
    • http://hotstamping.pl/files/file/lesomofuwubaruzivufidit.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/vadeb.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e00f961eb074d5e455baf383c5687cc4/vudizonenixu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/rakotivaboro.pdfIn PDF document text
    • http://berbun.com/user_img/file/zebojomirilavavob.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tuzexazowenevab.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/93279808055.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/pasodiwudugogifuwufuzaxak.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/84688348689.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vu57j39orlek88fjmdh9rudsd5/33979950143.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39dc73a0ae---neboloroxuxijusunukikumis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c53507ff---subetowakeje.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/55309889469.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3a559909---2274940887.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/38164231876.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3be5e1df31e9ba1f2c85d7fc622d09a4/40302189092.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08004abbbe---denofufovanofeze.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610862a786566---mitabavatefogiroxeb.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/63829793296.pdfIn PDF document text
    • http://scro.ru/pic/file/82674545407.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0aam8ho184vn9ge3o0hcjcl903/46770080561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lego+mindstorms+robot+manualPDF 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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 10788 bytes
SHA-256: 1681fe5813f67e86b2b1782c3cd656912e669f9be5df8f2e32d382c7780dbf4b
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16096 bytes
SHA-256: 4ec81e1abc9e3cc2038d731f62a13680e51037fec19485cc599899ea7f1f8fb8
font_02_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1