Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3e647ffd490918…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 11:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74e3d86846f4b372b19031268d3aa27d SHA-1: 0c850a719bb4c00996fb9bbdcc5c2f70a43af2ae SHA-256: 9b3e647ffd4909184050945c073b7ba8b4cc9e522aaccc5d54a8441c3969bc34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://andlupa.com/userfiles/file/sedakepitopugijadeje.pdf In PDF document text
    • http://ducthanggroup.com/webroot/img/files/kaxovepa.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fed35bc76ce---41793392771.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/52505241492.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/hq61frlurvom85oflaf7a1qd37/wutuxogufon.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/panituxineva.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/19884599862.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i2fqj253jvi3dviuo14a78q6l5/67243799495.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/bebed.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/59153332819.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612497120237e---46345355133.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/kawufomivowofe.pdfIn PDF document text
    • https://onecre.com/images/content/files/soturifoxafojunut.pdfIn PDF document text
    • http://soles2walk.cz/data/file/98919178798.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6cae5ffd3---72240519356.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/fevelup.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b5bc24fe5---76281260521.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/vurofap.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/42709296901.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3424ec4c062ab286e8da731b728f3572/tokolo.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/a32b2c4717767c5703f311bfd2f3bff6/86216848349.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/9877951703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=methyldopa+in+pregnancy+pdfPDF 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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 10840 bytes
SHA-256: 47bfd93035c7ef326ea6ee91f9c348801fcfcf24ceb78cc6ae91820ab0f73b80
font_01_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 16828 bytes
SHA-256: b1adea4c0921e694271d96887769f52da725b7837442b4de5a6306658ce162d0

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