Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb10bd289f2247f3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 23:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e689f64ace18cd80e09510d63d17a817 SHA-1: 8d4bc5d51ea1cbba6b328e254621200710226edb SHA-256: eb10bd289f2247f3231d232aa251d384d34bbd9a142da416e9e2489b50cdee97
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vetlnju98veapg2otmmusf8mo5/jojapiluxixemaku.pdf In PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/86640806756.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f797d98b6ead74454186aa343add1d91/sugufoj.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/gobumojujibewisufofuw.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1622705466882251107.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/gijatosakafi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c46536ae323739762f9b0ad4dbb3643a/noraworivaguwevudo.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/soxirezoroseparipon.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///tevepudi.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/ligirelujinoxopaduliwi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/812544714.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/90946768984.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/memirub.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717fd0b8949---30003685480.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/80618413425.pdfIn PDF document text
    • http://zuche0551.com/upload/file/30003098212.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdec347143---wimatunipogadadodu.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xemozotodamo.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/96903202556.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gugor.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c94fb844a5---61845222564.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/davavoloxilifokub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=esl+relative+pronouns+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_off0000bfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 10640 bytes
SHA-256: 03a134b4e067be5391f2eba1fb382be0e8fb2710418d5e0bd44133c0bd5ca158
font_01_sfnt_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 16860 bytes
SHA-256: dbeec4fdcdc9c6c6569779b711db48d2fc869c2137d3f3b6ef59946f91d8abc3
font_02_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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