Malicious PDF — malware analysis report

Static analysis result for SHA-256 a454e9b2e6f0d3da…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 23:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a506bd9ecf055f445a4825401a360db SHA-1: cb050978b2fb4d7e099697c34a06f6a694cfbcb8 SHA-256: a454e9b2e6f0d3da87b1d01af791db4bc3a57c5c2edc3329ca0ade9fa56be555
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 contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d60d73ba476---76224121761.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9887ddbf---fezaba.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/zoladuzobibelenuzurele.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97365148687.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/dimanopipudoga.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/wilitekavaxajifejizegemiz.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100b68cef153---46669009099.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2811d77e6fe3746028525e4f6cf70618/dodomowowifilej.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/galunutud.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16077c08f36bd0---guwupiposebebaxefa.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/be2ceee123d301e6a58d5411b753c11e/silesezetiz.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/95173884885.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/kapotavozanepaku.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab56ffe2ce4---41340008780.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/3964561934.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/43893783365.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/jawipe.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vq5qi5uv4047rnfqmtt0hmrpgv/foputekunuf.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/dadab14e6f87e671a256db83d9374843/gimeji.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d638710b8d8---soporowamajedazakesuladat.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/muvamopijafatugupuveru.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/28207293448.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850ac670323---8745285455.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/6960011744.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/72115136555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=consumer+redressal+agencies+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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 17680 bytes
SHA-256: 3560c5f35bf543a4396929e1c96029d0bc92a61c3bd85481a85ccd5a18192fee
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 10996 bytes
SHA-256: 6798e567d6e8fbb80a398e97266ad739b5967ce5924d7bb566811c1f66aa70a1