Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c78eef0c9104748…

MALICIOUS

PDF

89.8 KB Created: 2021-09-15 21:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19cac767ec5c26bcb3d7ca4c942099e7 SHA-1: 3827954d80f2ea9de8e950eaa2ad193a64de5463 SHA-256: 7c78eef0c9104748f63bbd372dcee63a6049746d9168242506d254d679d7a15e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://rivebistro.net/ckfinder/userfiles/files/bazelijorexarinuzol.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89408a062---megesinixukam.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/xabejos.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/14675521222.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/ritusunejujado.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/48424768500.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410a7382183---90715474862.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2sr43lmiv7q3eah8g8has14un3/26156408467.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kurovepadamarosipite.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q9rqrpt3pqnibhha7d989bva2j/91623345337.pdfIn PDF document text
    • https://congchung7.com/upload/file/nimopafofe.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/gaboxojiwijovodoponu.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/kapesizoketoxelupu.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/99842484218.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/zezuxusowusolefa.pdfIn PDF document text
    • http://vhktn.at/images/content/files/robaganapomad.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/jujugid.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135316222763---36862808899.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/89645334222.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/9504329039.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/jojazireloguzimopekoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=logan+paul+floyd+mayweather+free+streamPDF 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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 18896 bytes
SHA-256: c8d179282570296b6b3caacad44e60157ed06cdbf939f8704cd9d5dfdb5322f8
font_01_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 11112 bytes
SHA-256: b205dbb73c544a8b857ee9a98ae7d645bf7dab6411e0ab647d6e80f832240653
font_02_sfnt_off00014180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1