Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a676db28439a83…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 20:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e80b7f22eb92b9c6efbc3cfe0ea5a878 SHA-1: ec3564dcede37ce2463c3af183cb61be36fb037b SHA-256: e3a676db28439a83f40be43ecbf7d5967f5c6f1d758dfe455f8e126904aa5369
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including one pointing to a raw IP address, indicating a likely attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being flagged as a phishing trojan. The presence of multiple links to potentially compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fanghsin.com/uploads/files/202109050518046179.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zemitiludabefep.pdfIn PDF document text
    • https://wineart.online/userfiles/file/21986058755.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/64923522736.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/desoketunepubodul.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/fepawux.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/65579954096.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/kepipuwizovubagewafetirod.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/82901767387.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/podosovirodavav.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/44980015789.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/zekufemowotewuduvagixive.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/fewurisezuzalibomodulit.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/94324750644.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/11153668077.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/h43pn24hh6j552i656k9jmuosi/39132354343.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130c524b1913---64118083160.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/70324417637.pdfIn PDF document text
    • https://wrd13.com/force/file/melitodopoduvi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca55bc712---kesuwokibamovug.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613affc2999cb---fovixexarigiz.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/34816634186.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/voberat.pdfPDF link annotation
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324f51544f0---ravojev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=addict+games+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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10648 bytes
SHA-256: 0f623f03567e993667bb903abf8a11d8d8a10c3085735f43cbf5559bc439a68a
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 17560 bytes
SHA-256: 80c25037cb5693d7cae062679d0377a7cad873a505174311d16e3f85ba9a9335

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