Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e8c7845bdf0dc7…

MALICIOUS

PDF

92.0 KB Created: 2021-09-06 21:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f539a56a8a4cd0fdfdb44bb30dd0825 SHA-1: e620d44efe292aef1d0677702e2a135d83874dde SHA-256: 77e8c7845bdf0dc7959d51e417b36b4d250b61ebe4b127074ba87ba2391afce3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to phishing sites or download locations for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=aha+hypertension+treatment+guidelines+pdf PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e38fa95a5.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3695e3d8c5f1a546fa82342497bb1eb0/97855786739.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfc0871d1dadc7637221164f510b58ff/bajemaxofuxu.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/fapanakiwive.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/duliwutoz.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xerukugoze.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f311ceddd---legalujitowomaru.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a985e51d---ronafonog.pdfIn PDF document text
    • http://indel.sk/userfiles/file/50061795405.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/lekolegagijuwekegesolu.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/37464637403.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210731215559.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/548c468f5d86cd350a1fb0b57096d2f6/valufole.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/tibumulejevetaviruv.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f506180063---24358993635.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/neravotibasimebitazej.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791b9f879dc---pamuzebewo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/uv72a6nms4nv5lcafs832m7p9u/49078550809.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/jimometo.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/59347582493.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/lulupijizoweve.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/kigibuximevuj.pdfIn PDF document text
    • http://learningkey.org/userfiles/puxinikolorevedowutajifi.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_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 11140 bytes
SHA-256: 23123d6940d16627d030da89279797cc444fdaca7bc36dba8f19ae45c3ee46b4
font_01_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 18948 bytes
SHA-256: 2cb85e834e2c5f672495d9bc83226877a1c0d7f9b7e42c7524e77288047592bd
font_02_sfnt_off00014a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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