Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611d9d2072b33be…

MALICIOUS

PDF

97.4 KB Created: 2021-06-30 09:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a123d292e10feb16a496609b74a7876b SHA-1: 9c5e1d7f859da76a2f65288cca11a0b7104567a2 SHA-256: f611d9d2072b33be289b616664962a075c94575b202eaa56bc97c66a23f4c41d
156 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 appear to be hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis suggest the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hjtech.org/admin/upfile/file/71137076697.pdf
    • http://busankid.com/webfiles/board/file///12630848061.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/4443969804.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6818b9f6b74c1f486aed5e16d836d7bb/gumibipupadufimaferevefu.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1jfujlvsn7apjaifdgvoisskub/84424051916.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gaxadogezake.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/949e57cf221accf2b8829ee501a38efd/13788952736.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e68e5afdd2---19232233044.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/43175211603.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/25123df2fd26ee0caef811279840aa53/xizeberevijesedu.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/prtamnrct0pi00q00t2ugaqeb4/11186371789.pdf
    • http://dgjst.com/upfile/file/muvufusomuzelaxugotopexax.pdf
    • http://obasekiestates.com/UserFiles/file/xokofevexilijezekiwegap.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/83625545047.pdf
    • https://serviceservice.eu/userfiles/file/butumugesuni.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/daduxilumem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=commercial+management+in+construction+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_off0001196f.bin
c056d3a4fa08cd50d962fa40f1521df719cc435de682d66781fa617fc2d56752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 17404 bytes
font_01_sfnt_off00014718.bin
46d6d7840d358cfb6d0348dd5a604117a6c63165b8866dddee4dd309d879d78d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14718 11092 bytes
font_02_sfnt_off000160bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160BB 16792 bytes

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