Malicious PDF — malware analysis report

Static analysis result for SHA-256 859210be4aa69532…

MALICIOUS

PDF

103.0 KB Created: 2021-07-22 08:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b056ee35ababfc12a9ff85f412abc1dc SHA-1: 0bdeaed05bed918fe07d2ae644412ddb92cf56d3 SHA-256: 859210be4aa695322e2d7ab2449748aec43a3ac21672dd31457578396c779f29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript and external links strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e0356ed6845f2b63ceac875b632b7c6e/74825439301.pdf In PDF document text
    • http://khautrangkhangviet.com/upload/img/files/benabojesuzimepejena.pdfIn PDF document text
    • https://mauspro.net/upload/files/68988215147.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160875c11873dc---rikosejemawupilumorisite.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cced842a4e---30385952294.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73272196235.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5e0ceec0---65367730735.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/79066376933.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0629646785---20940552668.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce6b01af4---43727598750.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4209c20fc---51373982910.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/rewepajobepumeke.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/42676237508.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18ce94e6---68513423393.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/31510798624.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/851622e971def37325d0a28cd0448761/72460100414.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33717388672.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/29249611039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=friction+loss+equation+in+pipePDF 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_off00012678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 10592 bytes
SHA-256: 5648941c53de008ecd66a162c41280a6b3f40ab8002bd2ec3ae78e5c7a1df1bd
font_01_sfnt_off00013eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB9 20024 bytes
SHA-256: e864abeb6be8134710d924364c7b038cb14a526da3641e4f927a7d07b8a9d8fa
font_02_sfnt_off000173bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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