Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecd110b915e97ef…

MALICIOUS

PDF

100.4 KB Created: 2021-07-05 23:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fdde7c315ac9caf3b9d167324892aa64 SHA-1: 2eb7f8281d6f1c6867c0cbfb1a96a674fe27a3db SHA-256: aecd110b915e97ef63867581134189d5f0752d4b030ea099fef9fc440d599aa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c9e801ba3a7d130b25865d51a332caaf/48587863690.pdf In PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ohd7dkuoihtd4fep144tgpeac4/mitakeve.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/15239985.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cf40ca1e---14799143228.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/jonabaxowemofawafanat.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68531d1a95---6492894974.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad8db41577---pexatejewesona.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/gudujufenamurole.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/sulijorezudijumuvatevuz.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/tu8sspdcdj818ep0ii6f6irolm/zuperavatid.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d2948723a0f8b11e85fccb48f140a4a/36263696341.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cae6eda---faxopebifi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tilusizetawozes.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5t94d3fmbtr89e7vqijnpbj0l1/vinixeginefivibogamonidaf.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/watagugilodijeromimaja.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21f779cb6---8150476018.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/20276595430.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077378f76908---50489683632.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/37003466718.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0b9eb6e82152827f7fff1f1f77718627/bibumuvedovewada.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e30a4435c---43507701923.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/612b4659312a41c3758682724f08e7f5/poxer.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pidazepowikopuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=california+northstate+university+post+baccPDF 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_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 11028 bytes
SHA-256: 00c983116a0a08d2c23a9cd9b3030770af565311bc2283fe2e35d5edf5f81d05
font_02_sfnt_off000157c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C3 16936 bytes
SHA-256: f4c466c1ef008544f111959d25fce6e879d13c46f719eb8be342894baa792da3

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