Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee3ed4b876d176e…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 18:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7c5380d3f177256d458d65b02f1bcff SHA-1: 2578714cb37d25d85ee41a0d2653076b4297d60c SHA-256: 7ee3ed4b876d176e74f7bbe9b95578703d54aeef26f943a04de9a00521a0e106
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely intended to lure users to malicious sites for phishing or malware downloads. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of many external URIs strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=user+manual+nokia+3310+3g PDF link annotation
    • http://gidromall.ru/img/uploads/file/73617762090.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/mimuwobo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9504e52a9---95516612623.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gujikijuritusovajepegu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8a3c7ebe5a8421125ebda662ba906133/vizuxazakepetomotof.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8141vj0i3pp97ob7pg86hecp0b/79755188591.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608181e3acc60---kiketidowomivanug.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083249aa8be1---gunonap.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/2892163562.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/2274082286.pdfIn PDF document text
    • https://unosms.us/userfiles/file/taxudepotileravobotur.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30a1eca62---woxemi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297593ae72---37881326598.pdfIn PDF document text
    • https://alev.az/userfiles/file/lajojovopuvamo.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/361ca06fee50d0263b13f5b5981156cd/konidudupusigojelapivu.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/zafiteregako.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fipirud.pdfIn PDF document text
    • https://ms02bet.net/contents/files/42522940589.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078595756ffb---33367847914.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/lejukunikipufufebenag.pdfIn PDF document text
    • http://kopari.hu/files/file/tubitogupifevu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/18100006159.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/57608374751.pdfIn PDF document text
    • http://valeneighbors.com/userimages/39956073278.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/somomatasefesuzoxenel.pdfIn PDF document text
    • https://noddy.nu/images/file/38920253887.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_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 10900 bytes
SHA-256: 0b1177f12eed7ac63c969081a1f5d3f0a610012d10d3315ddc8c07257240e0a9
font_02_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 18368 bytes
SHA-256: 83ed30b923891d9b4217ce4f8a43b60dee0f266567bc0a9880c30a1f52889991