Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f4154feff3c9be…

MALICIOUS

PDF

90.0 KB Created: 2021-08-07 05:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc997c7308f23684c40f0823cb0b8f2d SHA-1: 0783e6eba4479865a7492a6b0c9565531282b7df SHA-256: 00f4154feff3c9be13ba650ea79b601c5aa3d106b4f8c1b7cca315e041fe59ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of multiple external URIs and link farms on potentially compromised or disposable domains supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://allg-gyn.ch/userfiles/file/sikenobebuvaluxowabis.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/tuzolakitesusojupowaw.pdf
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/ditemizonijupedawe.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1a1bee23b00ec0ddab7e136a60e1d516/pikolijepokajepakaka.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080da7d05fc4---43460471602.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e14d73dbd5---dovaj.pdf
    • http://edu-family72.ru/content/images/uploads/file/lananimotaxuxanujologasag.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5cfaced7---kironibavulafiwu.pdf
    • http://tribo.kz/userfiles/File/waxud.pdf
    • https://avigailpekelman.com/sites/default/files/file/povozalepixutolovona.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/fideno.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/bilijojopevakirebepeti.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6d538d3b---14270595582.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c096c190998---nekubugiveli.pdf
    • http://nfc.soo.jp/file/61522824705.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/lojilukozokipibodedepibed.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b78d0dccb3f---62729676845.pdf
    • http://kompletucetnictvi.cz/files/file/40224694628.pdf
    • http://netflor.pl/upload/File/fugikak.pdf
    • http://www.heksan.com.pl/file/lunubaran.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+meaning+of+sexual+reproduction+in+sinhala
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/56739294508026ad190ea4d555a5ccd0/sofikadilifejozenas.pdf
    • 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_off0000f571.bin
331771180cf74d46fbfbee431e4a3e552c561ed566d32262b8877d1bc551f669
pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 11260 bytes
font_01_sfnt_off00010f83.bin
99519a765ecad63ed512cd91f6f8ab8b9246d7c280c44e5a21a28f08351cf69b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 18328 bytes
font_02_sfnt_off00013f51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F51 16792 bytes