Malicious PDF — malware analysis report

Static analysis result for SHA-256 668cd1bc1a311ce6…

MALICIOUS

PDF

97.1 KB Created: 2021-07-31 02:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6da0e405765000647c9f65d93de33631 SHA-1: 92263ef7fa0bf4aac739d27240aa273e23b8442f SHA-256: 668cd1bc1a311ce66ca3951b2afac951db6c89dc2e0ee2b9863fffc1607443d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://irlanc.ru/uplcv?utm_term=how+to+use+revitalift+laser+x3+eye+cream PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/779dc14a7057d189f337a04cc0d87e7c/62936218285.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d44b68628---vugotirimin.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/nararivisabimosuvaxato.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/tovewelenopeju.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a138e90dad45f95775499b866734e504/45156981163.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/62842661232.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070514484369.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f34088ed8e033abd198bcf027ef3ef16/19558582765.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/50270357627.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0qm959diom9jc06v7vql6to90a/26626925423.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074082d8c35d---23754844947.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf19371a1c---27556712691.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce7e34783---23543226652.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/sawipajerajukojew.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/q3b4f74pl5e903091cagfgolvh/61979949912.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/minaxexagamimaxamorigev.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1348e5e63d8fb37753be2f36fabd6ef0/gugatasedilep.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/28968199887.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1e3bbc71f99daef8072cc7499713d5d0/budetapi.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a734edc38c1b788a72352c5176e33c35/3650247416.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/dusigozozijuvosud.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd697f5e6---9589410802.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6dadd327---90710353535.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_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 11024 bytes
SHA-256: 57e601cf14e1f6aa899398ebd3a6ba46b52f765afb79dffaced6b70485655273
font_01_sfnt_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 17552 bytes
SHA-256: 275805fd9cb751f8cd4edfc9482662c6041715c24b4f2d2584c8f1fd1a8a9534
font_02_sfnt_off00015e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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