Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee392c930fb5915…

MALICIOUS

PDF

97.4 KB Created: 2021-08-24 22:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c890f186cbfc5e6456180d3950619a8 SHA-1: 07ed2515e83192d37e58001d463463746cfa55ae SHA-256: 8ee392c930fb59153f8144b12a5a7dc5cc46de8fadbf481da9711681742c1a8b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/da9f1c1002fa83f96bb55286ff592551/nulorediv.pdf In PDF document text
    • https://isleo.com/i_photos/file/dapefovewadukava.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/sabunobijupowolitezizer.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b1a6584a7---63908963533.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/65734542311.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/93708313818.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wosogerezegapuduwutusewu.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/jegonerinojazoboti.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/72108712150.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/923ab13c9cf22d1a6e789f96c2927de6/46458201511.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zawosikanawukupodewemasi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160752abd8eef4---fibikin.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29df58251---texeketowikobinaw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c358aabc3dc---bugobedejijajimaxegise.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210522/file/kumezozaralinufe.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/78368688946.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/gubafidise.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/91218327175.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/af597e16650a2cb220ce5fc58d920106/99254816971.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/760d09dtpcri0gcd678518td5b/lijot.pdfIn PDF document text
    • https://blv.by/upload/editor/files/zewefexogulave.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/doguvife.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/dusoxeromovopip.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/232063c19555b41711fe1f89ba063f29/79662987296.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c0bf3d229---begax.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/loseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=where+should+i+go+to+eat+todayPDF 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_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 10632 bytes
SHA-256: 2846082d1b6995c565744883ee414fd532748fa25625aafa5c624768ad5d183a
font_01_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16664 bytes
SHA-256: 7b4f4a462ebc72f5551366a738eaa422c3234c1d9f57cc1df8b5bf986e95bb7d
font_02_sfnt_off00015eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1