Malicious PDF — malware analysis report

Static analysis result for SHA-256 9625cc0d0b888fd0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 22:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23036769d3c8619c2b4cbaa6fa57b121 SHA-1: 045c30e7d6d055d67e6343db29f4f1cdceaf6ac2 SHA-256: 9625cc0d0b888fd009312011979fd6f902ea5253bc845bfeb8171845009cc446
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous links on compromised CMS uploads and disposable hosting is a strong indicator of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cloverdiamond.com/file/72245943074.pdf In PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/19584658686.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/68257832829.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1d2cd68f271644671fc7798d6b9b5d16/tefokonunew.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08952458fb---vuximelupebunewopadu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095b5952103c---ruxegusalomizaje.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ac7b7fcf---razekamivu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/42294101690.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/xexugikodekeki.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/latinedomojiwuku.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/41314166318.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c49376cba---baxebizukewuloxi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/v1oir7io63lkva46cm3ld94nsg/37508609588.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/24781320810.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7269_20210525181238.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/xines.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/biwerawusenanopizosoxaku.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a0dd02348c3e66e2b59113ae74209575/37513760082.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xogesixabufinuxeroluwuj.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16123750c8dce8---25282693943.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/fiwotopevegufode.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/9753877687.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610248fcc7bc0---xazeferoxuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=turbosound+milan+m18+service+manualPDF link annotation
    • http://forum-auto.ru/data/files/rubozobovewiz.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_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10960 bytes
SHA-256: fa510c4a4b94f52533ffdd1468e9c93d9be2db98ea7a45642ef49e3a849da275
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 18424 bytes
SHA-256: 8d7f210472713c0f1389fbb6498359e31c0cb0b3fe031fa684c5156e15045d79
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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