Malicious PDF — malware analysis report

Static analysis result for SHA-256 3863e01a1149922a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 21:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab1d6a3dabe796f7bfc107c0e708d823 SHA-1: 4cc9a5106731a015b8d0254494295972d8a5029f SHA-256: 3863e01a1149922a845aeb5db3a1f132326484618c7da7b75eb4bbf714306e56
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs and the link farm structure are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://literie-depot.fr/UserFiles/file/jebozu.pdf In PDF document text
    • https://skvacations.com/userfiles/file/98402187125.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/72511360622.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/14455107284.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zuvutinomi.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kokukojefufe.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0a1e88de---91299662432.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/lupokasopaxazotadavonunul.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/penilowomosoweb.pdfIn PDF document text
    • http://www.moyekolodin.com/files/joturekavizenodufagumi.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/79451335681.pdfIn PDF document text
    • http://zzquansu.cn/d/files/22871864121.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/29671074454.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/zapatosi.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/12809314588.pdfIn PDF document text
    • http://intertravel.hu/_user/file/lidabus.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/51743975163.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/74281097452.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131062fc37cf---julinalotazifusu.pdfIn PDF document text
    • https://adikkedua.com/contents/files/donizipabovogutajuxoxa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e3c1ef8e52f75a7087de470c831af0e3/31300145561.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/89239802412.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e385aeb00e6a658b599e457a451b0240/37805448603.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/dajifevoviga.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28970f4da---69343412561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=monkey+city+mod+apkPDF 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_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 10560 bytes
SHA-256: e1e21103fcd67429f09b26d105ebaae153feec0fc9afef8053dd04a3dad15e40
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 18860 bytes
SHA-256: 0f64dadfbe3401502ba043b476f16d4c2722a5f5011fccb0e3384385a63c7003
font_02_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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