Malicious PDF — malware analysis report

Static analysis result for SHA-256 887a79324c760c5f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 23:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4ba0fea4a37e84ecd595f66305faf76 SHA-1: 94be4a6017be3b4bed2393f37fd9cc69e3b5cc9b SHA-256: 887a79324c760c5fe5aaacd33e688e200fe485203a88cfae6f726dd0745b7234
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=como+transferir+contatos+de+um+android+para+iphone PDF link annotation
    • http://www.jacenter.org/js/ckfinder/userfiles/files/miganukodorefa.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161343e9309e70---zanasenelobipetet.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/dibuwibidoka.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/34897170275.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/ketadogujatixiberavapebat.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/48373168655.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/33982537670.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe5f4d87c---34041070532.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xebowadusawu.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/xupesulejalalojoribune.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613274fda73f1---26630410216.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48200367577.pdfIn PDF document text
    • http://salespate.com/userfiles/file/23859989207.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/jobusawefor.pdfIn PDF document text
    • https://ms02bet.com/contents/files/27694889656.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/viwowafoni.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/39959742786.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5e0a3414a980ba61c6a7986e59f29819/84415310217.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b68309fb19cf938bd20d0b03e703146d/11153810777.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94b489a2e---45747488384.pdfIn PDF document text
    • http://pmke.cz/pictures/files/6059333056.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/mafivufalukut.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4c489ace---21869475807.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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 18916 bytes
SHA-256: 94b38f520390044aa78a9c0acc19a1e11af4b062f3232f8d97c00ffad6b354bd
font_01_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 10972 bytes
SHA-256: 3912a3075cbc4f29e4390b0b5922303f92ce78115e8c1174e6dbed33ebaf067f

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