Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0508fc5f9cc82b7…

MALICIOUS

PDF

91.0 KB Created: 2021-09-23 01:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c2332332d783c3f090e6973a1ca58b4 SHA-1: 613799b2b042d61f2770172b4812c52b25a9c228 SHA-256: c0508fc5f9cc82b7a853d58ce962c6ac0e7120b51613ac270c6c6560b4280636
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hb-hospital.com/file_upload/fck_upfile/file/83022184678.pdf In PDF document text
    • http://scbczy.cn/up_files/file/20210904_024831.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/53707384986.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce1cdda49---94857618585.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/mimofexakekovamujudaruban.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/10620286465.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/89378296600.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rukitosota.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/34155609894.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/dikebeb.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1fc2020f---xuwokakokuvijivetazavux.pdfIn PDF document text
    • http://centromp.it/userfiles/files/46055403576.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/foxufoboxijav.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/tififugi.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/bukogozesusi.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/19897265142.pdfIn PDF document text
    • https://turbooto.vn/upload/files/sofabitifivogudisek.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/94293473390.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/fisaruwunefunuti.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/3536776645.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832b907f08---48881344987.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da7bc283e---9541349083.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a603b7d9---16887935713.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/vanupenogofoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=2000+leagues+under+the+sea+pdfPDF 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_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 18884 bytes
SHA-256: a433fb3a76bd2917fe38818688d01536e714372d303aa094c70357a89bd06033
font_02_sfnt_off00014610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14610 10808 bytes
SHA-256: ddd0c8532efcd82fc29343705c02d4db2147d5af4d5dc9fb642d9bc700b24a89

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