Malicious PDF — malware analysis report

Static analysis result for SHA-256 041ef43bfedcdabe…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 13:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d0ccc4dc8584e72a2154f32e13c2650 SHA-1: cc25b915bbc0a5baa29a14270ad00c26b9725377 SHA-256: 041ef43bfedcdabeb32b6e89af962f5fb0a44e27e22a6b48c5bfdd1cb104a1f9
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://185.33.116.142/~bbyacht01/upload/files/barimidagomuzinobirug.pdf PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/451b67854680522a4d901e142cfe0ff3/76718565162.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/pimufupu.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/22120621990.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kuxazivedekoxovifeb.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/19507029844.pdfIn PDF document text
    • http://japhina.com/upload/file/59682055983.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/77801624750.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/gadowewatijatewofiri.pdfIn PDF document text
    • http://rideco.hu/upload/file/mojigoxetatagozi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161393d5a5633c---jivowamodejivabe.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/misawulojop.pdfIn PDF document text
    • https://oferta.lt/i/File/35842821124.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/vifunanebebenepatasedor.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fubaninefemopuzav.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/81631218446.pdfIn PDF document text
    • http://iscelenie.info/files/file/97207628968.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/525426cf5d17ba6d9f5d117b5bf8e887/lubekekozisanelawaxavivo.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11112776365.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/wuduxabupogupexifulerif.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210903004742490.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbae101d6---baxewipikixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=america+the+story+of+us+full+episodes+freePDF 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_off0000b811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB811 10976 bytes
SHA-256: 0408f5b9866ded42e779bbe36f5c2ed1bdd0ec57bf929ff8a3dee61b35be89a2
font_01_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 16548 bytes
SHA-256: 3381bd6d7e9178fedaae1216d424588fd4c6df39bcc493e62bb6cc6f99ae0496

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