Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aa6a7749043ee2…

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 10:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3cde3d1f9b1fbb1f291d9564c830a4e SHA-1: 043f6c35e4906115efb524065eaf758e57b136ba SHA-256: a0aa6a7749043ee2b271b6a64ba72823b4e0cc636e6702b5220307ffb485f57c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting a redirection mechanism. The presence of numerous PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://isagenixmakessense.com/ckfinder/userfiles/files/94599156395.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fc8cefa2---62267369653.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160874c1872862---65716452336.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/30504076945.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sttvf55jgg2ordt8nilq182uod/22368821447.pdf
    • https://leganordavigliana.it/uploads/file/89455108915.pdf
    • http://kirakuramenandsushi.com/uploads/files/46858060953.pdf
    • http://verduciautodemolizioni.it/userfiles/file/49471114274.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2f32b452---fudupetixafijajajadivug.pdf
    • https://manuscripthandler.com/userfiles/file/83601893473.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2b1164990f2c6b4621ffa6466e0b41b6/dugeputesujoped.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac3da099e---vakiwur.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1d9704e3bcb1a5b0fb5265832c6e17a5/50433959237.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/57e562ab540d30b57bc2b6c4df39b5ef/90988287475.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c2199847e---bubamuv.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c84f2f0e---fumanisatun.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b1744c9c---37409634283.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087453144c42---pomosapozipakinoto.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abc2e90a1ae---bezun.pdf
    • http://alphasigmaoverseas.com/userfiles/file/59199161440.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vd5eo89p23uvghahs7kmbtq1mk/gasotitogilisuw.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fddf3d109b---13430504522.pdf
    • https://ozmutludokum.com/userfiles/file/detepinowegiwa.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lij84tke6p4n1prf6fb8orh8l6/vazawitajazageb.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bffdc7e61d6---vuwotuje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=covert+narcissistic+mother+traits
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
font_01_sfnt_off0001100d.bin
291bcad2caf31805d896a4aaf5eccb247ab731e5042064d0cf1da6d23a800df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 17360 bytes
font_02_sfnt_off00013ce9.bin
325b4445577c274231ae500aa8a35793b2b12431213ac75fdc29c1a9f94a795f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE9 10544 bytes

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