Malicious PDF — malware analysis report

Static analysis result for SHA-256 11795ad42e77a137…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 08:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f404a3a54f52680d1ba9d815ae95188f SHA-1: a984edcc0cda6aad1bb8883ca634e96208eebba4 SHA-256: 11795ad42e77a137da102d3da5633d250165ce8a467acb44fe9f983fa7ce286c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to obfuscate the final destination. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gursakaryahukuk.com/images/file/gidulefevelalutanokag.pdf In PDF document text
    • https://radmangroup-ye.com/rgfiles/file/dejuterolumulemoguzud.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/sonowozikunole.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/12012059111.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/01c8631c8e8a80ebaeddbd27630e1878/66526072107.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dubupusaxurepepamov.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/28307256600.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6gtnp3rgk8pg3q57fsaic8q4gd/losepu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076051ebade5---lononalovedavinabozogodem.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1296bc507---madinepulixanir.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/22030673907.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/86009856272.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/jikukadobumepem.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/996c022e8f7c352007d7663a90608f9a/nimipedoj.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/nufamilovulizajedid.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/64478459292.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/wasidefuxegunujirex.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc895c5f200---zufunixinuboferaro.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/83132201224.pdfIn PDF document text
    • http://novichiha.ru/pic/file/61222501885.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c8bfe3bb6b598405a6e298a06b77df0d/zewetojuxazitinev.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607d0ecd4145e---forugemevofaxejugob.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/60161169619.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b88513b3ae7f32cc8267728c1e979b12/30776904568.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/526244fd2309d78c60e2d7244fec400f/fitavevarozeb.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b084b848---57333990451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+cast+of+another+cinderella+storyPDF 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_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 18180 bytes
SHA-256: e8673c54bb856f29aae6ecfe9c5eb5445958b3d0d7beb04ee003790a26c7f0d0
font_02_sfnt_off00013ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE9 10648 bytes
SHA-256: 234a6e5cbf2eb1de50e9799252d6ee5802bf12692769d45c80f0cab0c0d76576

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