Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc308253ecc2ee3…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 10:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa474cc312bf9231772be40a2a447ef3 SHA-1: 73666c5a3fa959cda640ebaee06834e3a1ad0658 SHA-256: dfc308253ecc2ee361e63471c0aa4a0eb9de9eb9f71ca45e028f29f3ce683ed1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://everestart.com/images/stories/file/95459552175.pdf In PDF document text
    • https://unifor975.ca/userfiles/file/87411506628.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/857b1bf4d1871782d830762d4944d2c2/garax.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/50532837109.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e7cf6b424---delujakejapa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6a77d4955---sozunozu.pdfIn PDF document text
    • https://85097781.com/upload/files/49450857788.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160902d2687ce8---serageletu.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/bilamewezenuxuwetarozuge.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dugifovijulizun.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/1a77b850367bfdf304f15da38dbbaab7/37998504571.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/musuxakewuxekinubulafiga.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/71852499469.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/e9ie0bf5ptkea4v409io9fank2/72904093918.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021523935147331.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/55224784997.pdfIn PDF document text
    • http://lobi.md/userfiles/file/fujumegowumideni.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/69932422024.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b677c3b9---27425435592.pdfIn PDF document text
    • https://icbacademy.com/upload/files/ledemavigenariwumate.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mmnno6eg85qeq52dir7if9hvff/nuloruni.pdfIn PDF document text
    • http://klenderbio.com/upload/files/rujoxogezewezejexaj.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609887c7156cd---2408148780.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/peliraj.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/13069243503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=currency+wars+rickards+pdfPDF 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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10772 bytes
SHA-256: 89a7dd440511bb9831c2134463e681bbe193f28d6868df9e87a7137b6729b190
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 20848 bytes
SHA-256: b58450dcbd7f91866e50d5bcaa7b6f9ae03baf2db3d966a45746006e84c6d2a4