Malicious PDF — malware analysis report

Static analysis result for SHA-256 eded3345b44f82dc…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 07:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68908cab830d5a8141d248a2f53ac7f9 SHA-1: f891d3cf331da8d10ab1d06efe3e5c7a32bd88b5 SHA-256: eded3345b44f82dc9eaed81f13c2904f9bc5ad520650e4265dd9c9f0d65efef1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to external sites, some hosted on compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of numerous links on potentially untrusted hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://3rproject.eu/ckfinder/userfiles/files/dizojilonozuvebiw.pdf In PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/15809229421.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/wuxopenepegivaxekaj.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/xetipo.pdfIn PDF document text
    • http://hevolta.com/upload/file/71927681000.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/rumemowomojomitupomopekup.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/rozajizivupewe.pdfIn PDF document text
    • http://mfcpavpos.ru/file/43218943061.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/wopikopi.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/govusolixos.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/5825173228.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/43987897263.pdfIn PDF document text
    • http://holzweiss.at/45376895713.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/gefazekazavanoma.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/29e324c7ef0371a50cff4d63929e1987/gamiruvipi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36c228edc---wenojisuposazejiseratom.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/gusuwizobavojubudu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v06a9m0pf9pqo0213fjql0l7g1/sagobomutekenazigobe.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ginokiwibatorafu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/89687066506.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/vinajevewupamaxafuxebuma.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/watobususuzofabididos.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/zatisigetodalug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+tv+google+cast+receiverPDF 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_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 10592 bytes
SHA-256: ac294bc9e9a784bff300b62adb7de527c722d2854b8d4ad29755de523046c5e2
font_02_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 17432 bytes
SHA-256: c075d762ade85da5114d98d98294f214adf337d25546d0321b334c4288359918