Malicious PDF — malware analysis report

Static analysis result for SHA-256 e851210957e528be…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 19:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa0175d9ed467bdae716949694732dc0 SHA-1: 9e614310ea0614a3f0d1bcafabf75fd8dd73b226 SHA-256: e851210957e528be3db6a0569a77bbbbd8f121460e4fe98f026f4b42597bca4e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ipceurope.eu/assets/file/texibupofojiwese.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//87527690128.pdf
    • http://vervesimuhub.com/userfiles/file/86179432907.pdf
    • http://cuuhoatudong.com/upload/files/64758115450.pdf
    • http://aaz.sk/editor_uploads/files/48248271026.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3f349949---94116925110.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a4d0d4f1634e198a466f1961c8b66e50/sijipudobefojiduzov.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba37108d4f---pamowatexibigurarurad.pdf
    • http://vivaibonomo.it/userfiles/files/74173561776.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09ad0bfbb---ludiwor.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac87f1fe3c---18045591424.pdf
    • http://benrassam.com/uploads/files/zowasodixutegizeka.pdf
    • http://amon-syotengai.com/userfiles/file/zewuwokizolusipo.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab086a1a8b4---60037134778.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8706e77aef---kufujujusawiraraza.pdf
    • http://sovaimm.it/userfiles/files/62490797310.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27f16a7bc---zalizifilu.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfba3725ed---80099062809.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2113bc5bcd1b1e90e5d430f90fc633b2/4749288951.pdf
    • http://ailizia.com/userfiles/bitusuwedijojumo.pdf
    • https://apsco.ly/userfiles/files/befunijizelozuvowuvu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=prayer+i+ask+the+court+for+general+relief
    • 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_off0000ee72.bin
ded7767ef6e99d12a17644c8a74083e6dbf46a9a1ceb499c9af641f2632d6060
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 10920 bytes
font_01_sfnt_off000107c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
font_02_sfnt_off00011fd4.bin
f7216bc23997f47a16a638912b72948f22175d80a7baaef5328569c8ca7fa39d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 17276 bytes