Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21a846a700d87ea…

MALICIOUS

PDF

77.5 KB Created: 2021-07-14 02:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7acc9ff6a9adfe35d643cad6c3c800e0 SHA-1: 13e62cee2e9f6fba866b1445d5f0bc6f79610c5b SHA-256: e21a846a700d87ea783eb0dfab8803fcaaf0ff84fa23365158b91751eaa83c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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=how+to+insert+a+pdf+into+word+office+365 PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/55336085212.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961f53bd9a9---57273479049.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8nvuch1f0gpuged9lkt83hcfv3/10049538887.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/10380221800.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30337539645.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/81640123425.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ba351b592c567qtsmijph79llp/riwukuluvujajuf.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/7750556719.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106092306597774.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090f65f6de7d---71484622689.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/13450776498.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/go0rl0pfcumv5l9d7jl0118n96/muberinufisuzin.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/19085667948.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/lobenixobuzak.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/zugovesabe.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccda70b7e---31765285378.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/bikadufomux.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c7f6594a---gurizojekumekadob.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4ad83s1j03jfddmjg7ee4t3k05/jezibobofimukelujizi.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/40830140169.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074499fac811---kudisatumevapufobujotajed.pdfIn PDF document text
    • http://babamoleskine.com/files/file/juzegijebit.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/gifukedololivuzotaviloxi.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_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 17068 bytes
SHA-256: 057cf0b158d41929afa128dee9f53ed224f36d32381f15f81c9823b363cdbb6f
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 11116 bytes
SHA-256: 3107251b477de89ba63640a073930a9de54267a3e2aadb300e338ddc508ec8c1
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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