Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ac2bedba29c9c7…

MALICIOUS

PDF

96.9 KB Created: 2021-09-13 06:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1c035a574deb46148b3768b517e0bfb SHA-1: 78e67d968e2434401a92d9a4fdb50efb15f09b1a SHA-256: e9ac2bedba29c9c7427f79d98b8c4d93aabc8d31637916de8e775b98e003f4f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613470c7ddb36---fopuz.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/13047245925.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/woxan.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/27628313231.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/63967651388.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/6069461473.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/7085916643.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/6738247265.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/22293853938.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/49629946683.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/tetofiz.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/86881412921.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/92630361435.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/sefemukusilaxekobi.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/xelagasobiwuza.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c479cdf59---97373889521.pdfIn PDF document text
    • http://carszana.com/image/upload/File/xawageluzutenufat.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ffba139e7c98c021aea7d129630fad83/juduto.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/51920553040.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kuwaxafojazobofemiwisitu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7e10babc9cc2f516a09989bfe0966954/66833189491.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kunugipisodovenatadotas.pdfIn PDF document text
    • http://immopolignano.lu/images/95366381187.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/38922728011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=baixar+jogo+subway+surf+androidPDF 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_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 10980 bytes
SHA-256: 17451358d23221097e48809b0745fcc1c19dcf595ec7305ad96519f6832cc3fb
font_01_sfnt_off00012d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5B 18424 bytes
SHA-256: b73e339cc353d00fecea52c5758b690b883a7555e2c3e4f206c6e08b9ffa0002
font_02_sfnt_off00015d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1