Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3235d5fb57397e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-17 07:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df56e40949698c5dbef4de94bfc1c8d8 SHA-1: 66c0097a67741eac35175fe30e518baeeadaa4e2 SHA-256: bd3235d5fb57397eff36027dfce617794f5a3a794c9abd91db5028a2a8bd6810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. No scripts were extracted, but the presence of multiple suspicious URLs and the high ML score strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.grupoaccs.net/ckfinder/userfiles/files/ralusibijuluwef.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/67231637060.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161438ac158b12---69544725444.pdfIn PDF document text
    • https://buzyhub.com/files/foxudopapal.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/nukomukizaxowisig.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kutimibasixajadozalaj.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/lozawagekiluda.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/dabujatumuxujemir.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/7308623557.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f904dfbc---80200270318.pdfIn PDF document text
    • https://servauto.fr/img/user/file/80099352915.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/jusinomuvun.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/22986096009.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210917090551.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902215030878075.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe5349e5b---3686812056.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/32760644017.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f36cb330e---72467706745.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/lesokemu.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210902113055.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/fatumasok.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/babonegalogupar.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/gupalazobuvokit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+save+file+to+internal+storage+examplePDF 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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 10988 bytes
SHA-256: 1582fac02727ee3d5d2977aad4cffea6bbbc19babd8f361ccec3c1b160f06f6f
font_01_sfnt_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 15132 bytes
SHA-256: a573c173a346cb8cadea2f2e75616315e0d0d5fe764ed2bdfbe610dfe83d01c2

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