Malicious PDF — malware analysis report

Static analysis result for SHA-256 8805c5694b5f2514…

MALICIOUS

PDF

73.1 KB Created: 2021-07-18 03:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc087ba3c2da0f1cc8886b4d1789a2d6 SHA-1: 6ec01cc3ad6dc3e30ec3818e7aeaa3b651ad3bd0 SHA-256: 8805c5694b5f2514fbbe4ae815092217f8f4fddeb010cbeefa74b93725b01d4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely redirects the user to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to compromised CMS uploads and link farms. These redirects are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/83874c5389effcca830ff2820f45c1d9/lutizubig.pdf In PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/92320511384.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47d96c03ed---52194392969.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rukofevobemugezam.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ls8u1cvr74pgh5uhn7b81p73s3/kurovove.pdfIn PDF document text
    • https://premium-house.uz/images/file/zolawimamupap.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75d754ce5---gelewulinumitefotamaj.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/33700555260.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e362983778d---panasotogakogobedesi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ubac4e0n6qoevcd3s43eaijjkn/varajatusegivoxo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c51d87c7c---fitakotuxom.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/nozolutedibalajet.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd073aed5---xinagabunamufuxelunenilar.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/18318429797.pdfIn PDF document text
    • http://amdind.com/userfiles/file/90300698789.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d23ed097---jesokekulonaxuwuzanek.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/puxijudugoputededumenalo.pdfIn PDF document text
    • http://haphadoor.com/upload/files/venekasiwusibi.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/zufufuteregalarisinujebo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52398acc8---dikesasowuxorez.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/iod5qcoajmpji7nakg07glt1ep/79578665663.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ad3b3783---fofulaxuwawatotejiwodud.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/51763997427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=redirect+button+htmlPDF 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_off0000bc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC62 10592 bytes
SHA-256: cb0443be27b24c279c83fb16fd92cdc18b125f117306866291a626c3ddf0170e
font_01_sfnt_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16568 bytes
SHA-256: bbfc03e7307d412da998ed132c32f9038bd043ea02af1ed71d7f957437447377

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