Malicious PDF — malware analysis report

Static analysis result for SHA-256 35390f95a815a23e…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 04:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8f0e7f2aa40accc6d10b72dd781fef5e SHA-1: ec317c1a24f4c5927d739369c14476498eb86de2 SHA-256: 35390f95a815a23ec959a44d866658137b96f0d98a4d648ce6c2bf5bec9aa69f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of links pointing to compromised WordPress sites, 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 0.9951

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://synerhu.ru/uplcv?utm_term=use+facetime+on+pc PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0c4bb45405d8fd8d231ef8b29a43dd8a/22823483288.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b546a27c8---tasamozebagararirezumomo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/orm7cgc4ughtsran9u204qub32/puvetizabuboxoga.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d547b17b7---4447947740.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/pupojamuwovejivokosireb.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/39273375421.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/61ea01b9f41ab5539a62253318c0685c/kalaxadoxuw.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33eef2c37a---zafewarunikukebifa.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/ludadofunomuramu.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/jajajejesub.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81063b26f---63028753604.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5b298dd6d21c7f136ea5811a7f69f8ce/zaragokeme.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5aito6se8k979ikuc00nbb6gjo/rokerumivepikawuwarune.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/91150821474.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8t1frrgia3ajvpvohode62vk07/47538175972.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/dobogiw.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/u9eqe16m3ttmjc18m63i4ltm5o/rafaxogamikidetukitibik.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tofokozisat.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62fca4a9d1---xakasoxutajemuwozujaloz.pdfIn PDF document text
    • http://citra.cl/userfiles/file/32878509755.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/59816556436.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b8287723251e1d948d82f19d99179169/junijuxexomob.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/97508407886.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/novazuvu.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 16996 bytes
SHA-256: 9ce6ac32e89f412d4ba878e9d13acf62e91637d32449c0c6d84a63b1c0f7108c
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 10504 bytes
SHA-256: 3e1715ba190cb242012db22a0c869e00ec90f4ee6300b01903b20e0cf898e657

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