Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54bc6ccf7106397…

MALICIOUS

PDF

76.3 KB Created: 2021-09-24 02:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f467f2e9f7e2c1665120517c84be2e8 SHA-1: 0cf84c16f22f4638c37d1d185eebca4a1640e8dd SHA-256: c54bc6ccf7106397ae33a6a7d79671456f108a178d6e8ca206c082111c41808e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to various domains, some of which are associated with compromised WordPress sites, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/boribivibu.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/bdfa4fcfb2912144bb2da971c6fe4c96/39972833182.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cf998549---potifetaduripasasetiwo.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/rizidopatobajupel.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614607a64cb28---tagubisoverubopowuzun.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/mabezolasuzusifigude.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/5121776970.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/62462876297.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/23770210937.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/retofitunotuloj.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc4ee676d2---medewazolofizimeziselepo.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109010720215366.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/78865532751.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/jupuragedanerapigamavapax.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b818106f3a---14280827742.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/52840102210.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/98758926052.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zoruvukutanudobaguxa.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/56255780053.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/54764951070.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/jozupufiwaje.pdfIn PDF document text
    • https://ms2oke.com/contents/files/11202038638.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/16121843973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=telecharger+emulateur+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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 10712 bytes
SHA-256: 6953ff8adc91b0ca40754575635fb1f5a97f30a2f2326b47339ea091281f4447
font_01_sfnt_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 17120 bytes
SHA-256: cfccd25e86ad67f10ab768dda92e89d2507c9616965b3b0fe3571dcd013f7e17

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