Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b712de4b062d0ff…

MALICIOUS

PDF

85.4 KB Created: 2021-10-09 00:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9c298d98d0f747eb1b573ade05c99616 SHA-1: 157eae9f57fc256827fec82b509c2f10c6376a27 SHA-256: 5b712de4b062d0ff4949dbcfc97a8ceb1405044a96966c9be64562798cbcc113
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories, strongly suggests a phishing or credential harvesting campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chambres-hotes-aube-bleue.fr/userfiles/file/tagagamutupa.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396df40afb6---31528278778.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/puwofuvexogaf.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/weraxibikikusezogop.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/18626039535.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613350357b098---wepujizolevejosa.pdfIn PDF document text
    • https://media-get.com/userfiles/files/46878635797.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425405e10b8---fobaruxurefegolurubofepi.pdfIn PDF document text
    • http://cataga.de/beta/files/file/fojagawip.pdfIn PDF document text
    • http://kezheng.net/Upload/file/sejiruwogalowifadisa.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/virelaponojoxasufonakipe.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nosawu.pdfIn PDF document text
    • http://cartopack.be/Images/file/5836028791.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20211001_DAD162EE0AA0C228.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/33940095780.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/93346628552.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/50353646539.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/vebufigebuluripemaralex.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/borilama.pdfIn PDF document text
    • http://viorina-deko.com/images/file/dijejareluxarasare.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/60590587599.pdfIn PDF document text
    • http://becucci.it/userfiles/files/mipukerozonunudamuvobogi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a61c49aa35---35539991493.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/49244285604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+hairline+is+receding+at+18PDF 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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10896 bytes
SHA-256: f05e3c673b0c9a660264651c9585c333e5dc442273598689c4d6634f2637c007
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 17352 bytes
SHA-256: 7ac566b26f161986eb5a17976b25b4a1d18e6f4f48f43b818222723a4da36b13
font_02_sfnt_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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