Malicious PDF — malware analysis report

Static analysis result for SHA-256 959ed7ce4858d23b…

MALICIOUS

PDF

106.9 KB Created: 2021-07-09 07:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 201bb31adfa4b5b6a786ba7ad7cd3144 SHA-1: b2211042d6812561c86683dd95737ff6ed008c67 SHA-256: 959ed7ce4858d23bcf1fb62c06843e76e913368df2f0b0327c27806b652cab22
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for further malicious content. The presence of urgency language in the document body, though not explicitly extracted, is noted by a heuristic, reinforcing the phishing-like nature of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • 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 https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2985ea5dd---39286460288.pdf In PDF document text
    • http://fotossc.pl/_files/file/kawunoxirepa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7e45624aa472f55da679eef7cb15877b/tutinuruvuwofonulitop.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/bazojidulos.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/wifoxexepilamare.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/xivifugitatozigotejujufu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb835a7ff---petid.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/86659096592.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d232406ffd1---jogesuziko.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc755cabec8---koxawojalosabavuruz.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/be708b088df5389d79b8840110594f57/viwubateguraf.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087107468988---44261179786.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9de6b5a3f---golovefelefugodelolelo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ef4f817f8---xizivozuvawom.pdfIn PDF document text
    • http://e-hematologica.com/users//file/paredojetinifejifamutifup.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f146a2fc1f4aef30f978f5ce24edb037/55254238099.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/esmj3u7ea0be3f8ecpfbqg1pi1/kodasubitivut.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/nuvow.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd91c727d---19374688230.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c5ddd1c9a916d2c47fb779859a16f143/rewofewarezojejamex.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c19f8c2981b---kivexibun.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608141b9e6610---galivop.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/39534aad723ce6de2cd302117024865d/dijibuzefizemamapuzew.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091f006be3fd---59200686830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vocabulary+workshop+level+f+unit+7+choosing+the+right+wordPDF 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_off00013da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 11516 bytes
SHA-256: 023dbc077780d8a3f53c6233fc49ffe93b664dbf4dfb1f58a0b843722af636c5
font_01_sfnt_off000158a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B5 16648 bytes
SHA-256: cee55b0d23dd86dd668f3e58610462d04af355f8443077a96636f937ec91bde3

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