Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64b95be8516cb0d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 05:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e5f095c66a255914f46af07937cf4a3 SHA-1: 65a1cdf6db9b4c476065ec4a93a99577ab1fe9e5 SHA-256: a64b95be8516cb0dcdca0bf497f936de1c03beec38d4d92f0e15e0cab8514918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the use of UTM parameters suggest an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://zeguvietnam.com/uploads/ckfinder/files/364512617.pdf In PDF document text
    • https://nguyenhungstone.com/uploads/image/files/tadam.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a727078dee659eac5b1a3534f3ec6d05/fuwofajilotejuperujemopuv.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/sulalisapusi.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/jekelunarifasuxazenofam.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/nasuxoriri.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/golugotowe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5c1b4ce39e7583929a84f909c6e549df/refuzezifepudok.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/lamezufimuropugusip.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/belamanunekomopifagab.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/zegisovurebar.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/94733548240.pdfIn PDF document text
    • https://tekmaker.com/upload/files/pimepexuxibuxusixa.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/47424905680.pdfIn PDF document text
    • http://spakimthi.com/upload/files/bamebogawadejobive.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/jorenipetefobokoduvononi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614274c6444ec---18992982097.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/89584764807.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/xivevibatekakegitebubopon.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/24009541145.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbe81d7bc---wawafitixobanitubata.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/tevupanesupetoxubi.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/satut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sensitivity+for+battleground+apkPDF 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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 11260 bytes
SHA-256: 88a115f63e83441d22b3f178bd914b389168eecfa7482a0ba1074b44f989c4cc
font_01_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 18340 bytes
SHA-256: bf34684f29dd18a80a4d7e011c4302687e17fa76e98102a90acf98b57b7d1ef7

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