Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea53c8d29078e9ed…

MALICIOUS

PDF

78.7 KB Created: 2021-06-28 18:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dac702584c0ddf8fd891081f0ffdb821 SHA-1: e3c628d6f530488c8c3454b01534745de13a6b5d SHA-256: ea53c8d29078e9ed41ecc8e05e74ab4aca5c2aa1725039cff4cd4aeaf34f9ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=relation+of+joule+and+calorie
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c9572ea1a922d540d36a8f28f26568fa/76956949509.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/q4tag05hu11hm048tr38fpqlr4/69693250567.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef9a415ad---77032915937.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829f7aaea3f---renen.pdf
    • http://ingmontagna.com/userfiles/files/64390934724.pdf
    • https://alakharia.com/public_html/userfiles/file/28212098770.pdf
    • http://churchtextile.com/userfiles/file/76485912678.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160821c4ed2367---rumurajalodudoposukeja.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ed1e7601---68604999198.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//678868560.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/45a7b39668a313f62d293e9c129bcb9d/27243567769.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609666b0bf24e---38927056405.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c5b47595---raronoriziwexeforefanuz.pdf
    • https://tecnicadovolante.com/images/file/goreruxuxetuv.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210530020546.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2b5352c4---fezojoxinutufevizagoti.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_off0000ced6.bin
1f54776d06155cae906b36756c3e97791b5821480e436e415f1f4510d0ccd4da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 18056 bytes
font_01_sfnt_off0000fe27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 16792 bytes
font_02_sfnt_off0001163e.bin
f0f2396a244a8259aa616bf8b27cdb2d2ecaf2cc696fe1ce2131a19c8f7b89fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 10576 bytes

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