Malicious PDF — malware analysis report

Static analysis result for SHA-256 944de2163c516708…

MALICIOUS

PDF

99.0 KB Created: 2021-06-25 21:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd1abdc6cc5ce18ac36cfa331e4a4eae SHA-1: a1d8c6410322e88254b6bdb296258c128275658d SHA-256: 944de2163c5167081d42061c13b64be87258ec29be12ac9d3d637217919cc836
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content. The presence of multiple distinct hosts and the use of form-builder upload paths suggest a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919c42bbe9b---tasewopogobolef.pdf
    • https://eyetracking.pl/userfiles/file/7659053463.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a5225f74731da7ce3592a641fe8d79cd/12799591733.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ufengr7o22fa06aq1inli4scpf/22098524243.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acb34691f---xusukuvinigubeb.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f833147ea---94632844540.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/s4ufbrjj5q1t9op0sf8m9au4e5/45396456707.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee0d43f6a---86222527181.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe49d9772---86169457599.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b456602d706---5940441553.pdf
    • http://sk-uralstroy.ru/uploads/files/zoketamazemot.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eff84d54---33482132783.pdf
    • http://washchienluoc.com/upload/file/86911446694.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5ad2895a---lasaduxuvekojul.pdf
    • http://cec-intl.ru/app/webroot/files/file/jimalelevapupexapuzu.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b907553b9a3---15867142024.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9eb0d8b813---kulotilexubed.pdf
    • http://studioindelicato.com/userfiles/files/79268943394.pdf
    • http://skiflogistics.ru/userfiles/file/49019358286.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08053e974---50505182711.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608777efbe839---lawatafuninuvebisun.pdf
    • http://domholidays.com/userfiles/file/fikutatasogig.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e96b3deb82879983ecd05954b3af14e8/27312504654.pdf
    • http://world-green-hope.com/uploads/files/59960411234.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=onegai+my+melody+characters
    • 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_off00011faf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
font_01_sfnt_off000137c1.bin
e9a4e94378272bb5c85b530a0cf81d0046bfac457f4e836b903b6e875f12f335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C1 17616 bytes
font_02_sfnt_off000165ca.bin
1ccdf89558af05cfd56d158a9b216c0f96df0d2ecde04e1d27e68c099136adf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165CA 10956 bytes

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