Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc9555066294ae5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 00:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c93fcfaa8d18225ce044dcb2d5756c59 SHA-1: 9f1884ab3cfa8f3064b008379a9ebd04f26e3260 SHA-256: cdc9555066294ae5317bfedf49c8d1a07cf7d4e7b6a0a1940ab4b63a6359a321
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161384efbb358d---wabirolutusuwudus.pdf In PDF document text
    • https://highlander-inn.com/assets/userfiles/files/karovafotav.pdfIn PDF document text
    • http://marymo.ru/uploads/files/wusabakisejowodetumof.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/041621286513.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161349c472d4bd---43944058028.pdfIn PDF document text
    • https://thehouseproduction.net/file/74302508200.pdfIn PDF document text
    • https://congchung7.vn/upload/file/pajup.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/nukofufeda.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/38224981845.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/21639624611.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/35723031822.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/59022776033.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dp3i1md89kp7mugvhbdkcib1q4/guradivivevibuxusiwex.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29a10cdd8---lapozave.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/zitipemezumineguposa.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/72673156689.pdfIn PDF document text
    • http://pileki.com/imgup/file/vomobuvewutabijotimi.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/86508834302.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130187db5d0f---ruginez.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/35068458092.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/13304851101.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/1298980878.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/839a635f1c809a317c95c09641f4493a/4525546816.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/kipafeleniv.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/17367948304.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6hdfrfip1dir81akrhe1i70g12/32123854906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+nun+full+movie+in+englishPDF 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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 17492 bytes
SHA-256: b2d250f682175f7139d68412b368a4b37a9975671e09851994693d74e02eaff6
font_01_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 10428 bytes
SHA-256: 955a60d34806b8dfaa53a0631d6556f4864abb11900f7a09367c67c5420241a5
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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