Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88331f0a1c66eae…

MALICIOUS

PDF

80.0 KB Created: 2021-06-25 13:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f630f980d8a2524f80c99d43feb7d395 SHA-1: e950036a0a0dcbf124a35eb57cc19b2e5af03816 SHA-256: d88331f0a1c66eaef0556ea212084ab91a4b2e4d3294dd8dac6c2d5c6f103785
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7be59a4302a10cdaa1622f25062536ef/xujiminadomevovojebeti.pdf
    • http://www.aluvascientific.com/UserFiles/file/bibeg.pdf
    • https://motacademy.it/file/36141492290.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d220bae1---25287732761.pdf
    • https://wita.lt/images/files/63782572238.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/1612a07aff6fbee16824ce6aa60a97aa/noxitojisefuzamag.pdf
    • https://myphi.biz/nbloom/fckuploads/file/nubumaxorujepimiximeri.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/35b84f37d364418099fbc894a825854e/39524749268.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b316090f---juretaporuzute.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d1c1d6bd---vigofizeb.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160960691270d1---2914412300.pdf
    • https://aduanaldelvalle.com/userfiles/file/nejetuvolitizes.pdf
    • https://adasms.fr/userfiles/file/87744384865.pdf
    • http://betaempire.com/uploads/userfiles/file/file/vujasusenu.pdf
    • https://mldom.xyz/web/img/podborky/files/xosibafalujeper.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=and+i+hate+that+i+love+you+so
    • 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_off0000d6f3.bin
72973e3d9025688853e3a5255334cd363a78e78fbd27f72e9677cdcd9e3c6444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 10508 bytes
font_01_sfnt_off0000eed8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 16792 bytes
font_02_sfnt_off000106ea.bin
7ea90036ce49fc28392ece410923a89b73e0129a89ed8e7ff1c95e5ec1c0dd8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16968 bytes

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