Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce09d4c4064ba1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 02:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: daeaa6e8c05733a8157eaa4c525b0c0a SHA-1: 96a63c3e2a717c63d5fe79fe8e1c929d6864bd4f SHA-256: c4ce09d4c4064ba1c59534f748e46ae61cedc03ccedb8caad9cce96a00b1bf84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=how+to+set+a+video+wallpaper+on+android PDF link annotation
    • http://vsrru.ru/userfiles/file/52999404812.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/32924980943.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/26456863028.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/nupizuwamirokijuridiloguw.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/wizojax.pdfIn PDF document text
    • http://naso10.com/userData/board/file/godogopov.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/64176557238.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/ronefiwomotozifalili.pdfIn PDF document text
    • https://granitnet.hu/editor_up/dozev.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/2810233247.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/19072988711.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/zifare.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4696387d2e0df26ef0ca95d9ebd83a72/70268096075.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcbeb8b64---binuxuzebodukowamaw.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133048d73c9a---83744296048.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/savid.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/sikalezuxo.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/50763243912.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/lafolozenu.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/75325091117.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/64626539490.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/zetufewenuzenov.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/baselapazaluxam.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/japidin.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 17020 bytes
SHA-256: 9678bc23e6ee2aebfdfd6dd3fd06f21e15a53f15359513a0eff8b3f4e15b4c65
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10528 bytes
SHA-256: 9e94688a37f0b927c0024c0577dfa08c663885cdcf571db391e388063a6d6ea7
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1