Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0216e0be126910…

MALICIOUS

PDF

144.0 KB Created: 2021-07-03 07:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 572248ca55a25853ce08c68bdeda8f16 SHA-1: 2f0a69535178a3cad75a14a25c3538328e4398e5 SHA-256: 2c0216e0be12691063d77d9ee6944fa4e86205fceb53468369d5f907179a6f77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://biocoils.com/img/file/fikeramekidozasafinig.pdf In PDF document text
    • http://classiccar-jp.com/js/upload/files/51879349763.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/62521602917.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200be7a9b1---99619011685.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be71b6c8f71---mirisajo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78d6a1747---9918355375.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d84de0ed73889a793cb64ef7879e1b04/wibilijifebiz.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609074f1f263d---digulibusijuto.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/pelekolitopam.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/038ace2b57017b93b2110d74ef776854/80853721681.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/33471066583.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/fobazoxajolirinekokuminew.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bffis27j2j9thkt7646379oa05/wuzedik.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0398a1e0b915bcbd21798622e26f4ad0/64099454697.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/mezipuvaluwakolilux.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/70bf7ed1c5a1e0ce03897e87009da763/89028831741.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a849f23f---gaworenetesun.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jamisudoferezagalubujijaw.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/37385439974.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1f7e89eb---zojelesedopedoxotarufa.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/60849671644.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9c16a3a0c---jefuxexubozokepalabate.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afe56cfab---93659068863.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e1e38501---resax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=james+the+apostle+and+james+the+brother+of+jesusPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ad8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C59F 16332 bytes
SHA-256: 5ada5cde21648681688a5ccd73aea7578bb2492fb1fbc37553a9cc17f779216c
font_02_sfnt_off0001dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBF3 11032 bytes
SHA-256: d86a3fbc6897b30c8d9101ee1b355d88b918ce7474a7a0d1c67a29dc66fdc6ff
font_03_sfnt_off0001f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F536 25628 bytes
SHA-256: b29cbe21ac4a6425bed3da8e394615d7335b7e4288a1079969631e22fab4ff01

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