Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f88bb98d93b9287…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 22:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a429e6f7a9df64e3fe087fe3f8ca45e SHA-1: 6965872dd6adc837bf60f178ecd4256e044eb678 SHA-256: 7f88bb98d93b9287ca418714ee757ce3caef78566d272333a183340a4412a8c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://itchanoi.vn/uploads/news_file/49123587240.pdf
    • http://sfera-vlad.ru/img/file/wobeg.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k9agis9p9cuuvt95c3gq4143v4/vugibefuvufid.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a4e948737---lanutiwojidoserax.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/smbhgip1dncftgfm1rtgoaaetc/zunujadoxebinokafatenu.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/eed88d83c3d51217f4c1ca0ce75725c8/11205544689.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c554701e---86059744941.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/60qjgmj0g9jlnjamk1deb8u0e0/98276865087.pdf
    • http://irinaburmistrova.ru/files/lazojekusurimamin.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b11463542---xovokenikevog.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/405cbbda226b777a6d7663d206cf027e/kijemesopati.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/f6fsedlg6edovolmfgcke0ts01/24602756945.pdf
    • https://serwisnawigacji.pl/userfiles/file/99131154945.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210701050135.pdf
    • http://galgalesh.com/userfiles/file/wodurevugotagesodij.pdf
    • http://poolprotektor.com/userfiles/file/xidutajigorabuxakazajaxe.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a8a32a5b---pediva.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d321649e6f---53439853841.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95e6a449f---50502979889.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a68ffghamoeofpdmc20n7203q6/lubowogiwukizuwuzideban.pdf
    • https://agatanorek.com/files/file/kudufojirexozinu.pdf
    • http://email-database.info/userfiles/file/togixemup.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/10407e0c638f539668ca8eb4085fa7d8/jagevoturenotiwobokaderow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pink+and+yellow+ombre+nails+coffin
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b3.bin
dee7dcabf040a8be65d050c818280ca4e08249912248447e537c9a1ae19cb0cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 10972 bytes
font_01_sfnt_off00010a26.bin
04da52393e0516cb146a00a8ee4b93913b86f77a51888ef7037976834cc91e49
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 16648 bytes
font_02_sfnt_off000135a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 16792 bytes