Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a99c7bef7851e5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 12:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da6490ce33625b1235699e714ca292e9 SHA-1: 3e239b00909d670e2bed62030fa890b452fd9bd0 SHA-256: 36a99c7bef7851e5aa9d009ec257fa97175f6ca0cc480d7b8516c9e3508c76bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple compromised websites, directing users to download software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing unwanted applications. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to exploit user interaction for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145edc9819e9---tudowo.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/52e7f963c6e5a1a34417462dc04eb780/54636924946.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42369a4c7---28076925234.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133192eca51b---fidegawuvotasekose.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd3426c4a---52523862966.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/63095352672.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/jazifokoporal.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109080726064185.pdfIn PDF document text
    • http://ijfbn.com/editor_up/sotoxuter.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/xanivuregoref.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/73720541404.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161419b00b4bf0---bofowatolupu.pdfIn PDF document text
    • http://355353.ru/userfiles/file/24927757929.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/74631772698.pdfIn PDF document text
    • https://protum.se/file/69618091678.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/jivukedizereruzulopujewap.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/safefot.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/67261341110.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/momotizamotutusof.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/tasaxuto.pdfIn PDF document text
    • http://leeandrewdavison.com/download/pavalobonejumilur.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/96839932436.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kazoponowopoxi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/suximevekigomamezugigefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+picsart+apk+downloadPDF 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_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 10660 bytes
SHA-256: 3f6ec209f57c290e3aab42efe9af589c4043303ba2b291338a1dd07747bdf137
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 18376 bytes
SHA-256: aa26c32d06121e79e77f47a87606ed27ee8c5f19017336792746a2b1ef869481

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