Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b0e09ce5b5a37a…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 10:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa01bf7c49097114bf9872b6d77ae893 SHA-1: 6f6d914aaeae53a5f84395211728384ef561e5c0 SHA-256: 86b0e09ce5b5a37a1b77fa05aaddfdf6f65e1bc2d3a51a822cb30f1ba7e96eab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it is used to distribute further malicious content or phishing lures. The presence of numerous unknown URLs associated with compromised CMS uploads strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43284cf1d---53484728939.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed77890d3---wuzuxevi.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8bd787125b54ecb0f2006022a18a4430/39440944411.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/89856355153.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e37r7dlnhqd06n1orf8f3252gq/xinokexixal.pdf
    • http://alituncer.com/userfiles/file/gakakaga.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/24881548295.pdf
    • http://accessiblevehicleservices.com/userfiles/file/kuwuvidesosevop.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/855f37f3c3ac48dd13b61b5c38b573a2/wapuzalupekuvabujewa.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6b9394f1---robazokutolerirataja.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59788041c---wevemaf.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b68821ce9---fotejosozudisujemejutepe.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/92e4f23df2dc94bb58eae78a06220e2e/jezoji.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6a78c386917f6e2e3b1404c69bf40bcf/ribituxapaja.pdf
    • http://jonkmp.nl/img/cms/file/66246231898.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/53396858117.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ef19b0b8---85955898895.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/79b44e8a3ecc8ac5e3f46f92f5f24210/bomumofawusezufejibivaf.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e161d5722ece3a123ad28d2dde30d1b0/10442430245.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2a82f03578db5992881006e0034e9eb3/66680694941.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/do1i8u91d7vdkubp8pkdp43mru/43360673846.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37261448a3---39591303542.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ee183965---22101689269.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jv70o504q4jum7b7q3jpncgo90/zodubavobijosowe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=braxton+hicks+contractions+at+19+weeks
    • 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_off0000f13b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 16792 bytes
font_01_sfnt_off00010952.bin
e28cfadd1d67a149dd63b846d4008f58ebaf590f1f903f2a7595083d920c77dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 10836 bytes
font_02_sfnt_off00012275.bin
67402642a2ea00fe88ab9e81e68c750773bceec778f2f15626d661ff7b7c7ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16948 bytes

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