Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6077463125bd746…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 07:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b363c080a5e9ece47c01dd2136713c3 SHA-1: 30598831d63b402cf9fb54b72f83a363c89f367c SHA-256: b6077463125bd7467831b5d73606818e6079113164aeb0340a38261f75da490d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious purpose. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=pathophysiology+of+disease+an+introduction+to+clinical+medicine+7e+pdf PDF link annotation
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ec80ee6d---kugaxuxezobipewipa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b54da4bf4---5822858681.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/00867084c2c89e18f2d7fea538daa7e0/jilakodixenimesajuxojed.pdfIn PDF document text
    • http://alltechsro.cz/files/55466253875.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/sulubegexufomu.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/jusodesulerakipufukidazaz.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dbffe759b---kopakebev.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/75f7148369a8160319a5d9026184cf12/20798432137.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6907d151a2---49667326350.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0b2a03bccbc32b30b199f8d0494edc52/rabag.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/16903924425.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf253fd0---36120215233.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/35076797258.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/63a8c756c4f463ba5fc86487c77ec148/luxuzobobuwakozev.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/runuvodikudopobudufuzobo.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/pawipozavegugezojatibanol.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/57401500872.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/zituz.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8186ad0cb---fupalupekejulejifalunak.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/39d22881c978aacaf217efeff0a0ecee/55557295154.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/88548434206.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/zomik.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a59e0e9107---rimawim.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/xovebeloxusixaworime.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/99350516416.pdfIn PDF document text
    • 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_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 18384 bytes
SHA-256: 471cf7f775f94a3c4e8616dd4e2c85f1138d635d7f7cf00f0acee63ce6b857d9
font_02_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 11332 bytes
SHA-256: 568570b779bf0d5266cd7aef05eb76b8b5b1afd98069c388fabd3a4078a5f4b5

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