Malicious PDF — malware analysis report

Static analysis result for SHA-256 604659a2ed51373a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 14:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a6f0e1cff353071a70c10cdc3a036fef SHA-1: 5bf33bf735d81e4de9830d7ab349932adf275b2a SHA-256: 604659a2ed51373ac0d50600620ee8f32bbd033e0004efafc7245479c45b017f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/tonawasilaruj.pdf In PDF document text
    • http://ccspatti.org/userfiles/file/32739196346.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210818194450.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/72302714074.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/vibudipuleteze.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e8549195---59958040028.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bebedadenejuza.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f55d8462b8---67115208825.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a300ba64bf---gowovodubetamosule.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/todemodus.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/16315920660.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/lekuridiwigefelerufipez.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825fd78eb85---65697449477.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1bbac4a40cb1800eb6bb76df1aa6bd26/tanozanemimewanuwinit.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/1433479023.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a92e4e628---66450857121.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/dipekagowem.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/91341113820.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c5b09269---gejutibudusazugofizas.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/vixeruvajuvetis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rolleiflex+automat+instruction+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ece2373225bd1c89fd66c86c87251a26/nafinejexes.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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 18616 bytes
SHA-256: dc1371c291f004e2504ea64c5c1e5e7fe01bafe0202135a3c9a01ecf27404d02
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 10744 bytes
SHA-256: b0bcc0940572710edba47965bbd6845ab8c04aea93db344ae5508526096e4478
font_02_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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