Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69704f1f0ee38d0…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 06:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e58d9c683020d6208a00f24802b11d3 SHA-1: ef76e0db895ad846d4b69c4e2246d2bac528e505 SHA-256: a69704f1f0ee38d053bcc25fa2f2cade1ad1361c1e29b15cd200190c31876798
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://diaochue.vn/userfiles/file/20636754085.pdf In PDF document text
    • http://dralituncer.com/userfiles/file/75891174476.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877c9217794---77880123643.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/39808820940.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160daa93ac0f72---riwamanusipuxigamubalob.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210524083806.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e60bf128a---8579701812.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/disopexiwovun.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/86187564153.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4de30d68b3e33de06cf5f270edb525d0/15197277082.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/detut.pdfIn PDF document text
    • http://learningkey.org/userfiles/96636309253.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/vlv4les3b0nb7559840enkaomf/wesus.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/54870954584.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/7604598910.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/36638982354.pdfIn PDF document text
    • http://yjccnc.com/upload/files/46657784277.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/fuwidixawesofumawumoxaz.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/sapusafetul.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/nofaji.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/jewuseguf.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b4825ace---rokemawidepujixonone.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/purojelete.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/668fb58893326314ba51767536db4647/91108243705.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d981be42733---zobipitegevidotibipuf.pdfIn PDF document text
    • https://orrizon.ru/images/file/58000675002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=las+3+revoluciones+industriales+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_off0000bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0D 16864 bytes
SHA-256: 74220579f537b474b16a4106b0add75534a629285d56429044af539c20b20e63
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10908 bytes
SHA-256: 8bed704ae97e9415658ac5095c6a42c646f20af0a5ae1d33dca87a6fb4994767
font_02_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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