Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae26d88bc3612515…

MALICIOUS

PDF

106.6 KB Created: 2021-09-01 00:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e68087115669ea6ac7d9c48ad9b02e93 SHA-1: 6033cb7cbce9782b2f80432bcf1f55bf26ee9761 SHA-256: ae26d88bc3612515effe83e5cb87bb94df2d0a6e6af82c128021f70338853ae7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a phishing or malware distribution campaign, consistent with a Spearphishing Attachment (T1566.001) initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=the+second+feldspars+to+form+are+rich+in+what+mineral PDF link annotation
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f9b307a396456734a24a33b9dea19f36/37481070722.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1610c4c9c---20782732613.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096deb70fbf3---gaxenu.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/90053471715.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/62brm49h5joq69bc96tk1lk2i7/bufudebepiduxifanumebo.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/84375000136.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/geh4po1a9pdpcslr9q9feeo6r5/44256179527.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/05ff594649df16435e5a06a695f7a127/50335312188.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f342657c3892544fec2268f695219ac5/kuveberalelinadim.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d07a5b36cb0dc550e6730fce7e2f7e57/45243716168.pdfIn PDF document text
    • https://gilbertems.com/videos/file/66388790146.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/sarunagorebomejima.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ed0a76bc---ruxedisevutumi.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/meparaguzapesesulufogap.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/74667027960.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/87676878892.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc2e41d76---83592450675.pdfIn PDF document text
    • https://edusfera.pl/upload/file/fenumikuluve.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/jelagazijubijuluvalu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/68af25826b6326b2363c3089c7545ffc/15414513211.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103169dacdbd---kepajumozomute.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/373a0f951f45eea7b8c388ef560985f0/20522874652.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38c621283---31900618743.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5daf35d775---23457141231.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5585b1f3---92918893928.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080dca4b2bae---wifasedajarisadej.pdfIn PDF document text
    • 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_off00013a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15253 18272 bytes
SHA-256: 619a94a16dd5f666c9a78e136dbaa979b0a1fa56b2ee1f6196ca7032f4cc4d5e
font_02_sfnt_off00018258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18258 10932 bytes
SHA-256: eb7a0e193b5f0d1f06c6040722a28fed53cdd4ad635e44b9004bc9d514aecaec

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