Malicious PDF — malware analysis report

Static analysis result for SHA-256 b828f5812e991479…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 07:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47103fdba47c26b8b66fa51a60d9111b SHA-1: 63102ea537e361b765fc5ebd4f0d9f2e5e304827 SHA-256: b828f5812e9914795a0a2e82f322c799828d40c66f55c11e529dc0fe32fa576e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of JavaScript suggests an attempt to execute malicious code, likely to download additional payloads or redirect users to phishing sites. The numerous embedded URLs, many hosted on compromised or disposable domains, reinforce the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://njuhome.pl/ckfinder/userfiles/files/dawigene.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ff413c7f1da34a370c767749f03ef65f/juforij.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/2c4263916df60eb082713501700f828d/topesodofudu.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/delemovemodotugezewi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/4bkc4ilgikgkt7681eb1rd118f/kolesariva.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094deef5f2e2---fukadisazozudedivuji.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/23778337208.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/lilozeruze.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16110debd8fe4e---81333719614.pdfIn PDF document text
    • https://eslms.com/userfiles/file/gepetanef.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/vevefijimoguma.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f23b28fc25c3c013798db9e29cb8186a/75193861342.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/8354356403.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ean2aeh4nlbsrhi09pfp2vlac4/37301916173.pdfIn PDF document text
    • http://jiab.net/userData/board/file/vasomitixipetiz.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0bf8e235ace8618d481f1dac89328b66/botesipepupinemexe.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/80753117696.pdfIn PDF document text
    • https://stopserv.ru/files/file/rifosuxerujifibuja.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/92421504969.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/pagedufa.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cnlv36n3345kc5qu3k025boefr/sokesezeputas.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/kanexavogogojakuv.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8gbuu3sgso1f7ib95855lf4c7g/89173151043.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/84083352840.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/5144018402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=security+guard+experience+certificate+format+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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 11140 bytes
SHA-256: 6d0ebae1e13d0115e92ddc3bb2061347c505409fadd004e01a6c7fa9ab31971c
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16440 bytes
SHA-256: ebfc2958cdf677f10242961f2a0fedababe56acb20efc74c312e1cb12c93eb69
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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