Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c536e4661eca8a…

MALICIOUS

PDF

84.4 KB Created: 2021-07-15 13:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d96f5512d1aaea317094b6b920a7d436 SHA-1: 7e6318b3a150f0f3cea3f3cf0900e374736dd7d8 SHA-256: 87c536e4661eca8a5f45836b86b06bb46260bcb95cc65db47459950d5e348a62
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d1ee2115---piruzabofu.pdf
    • https://powermailer.in/userfiles/file/tupabukugobawilirabo.pdf
    • https://thediamangroup.com/_images/files/53439987153.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a20e30b6651---91612416530.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce45c5d02---nemixaxovasiromefedafa.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079812d79129---77631419828.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3kblj39ppbvph7ldkgfgsori27/meguwakozog.pdf
    • http://shreejians.com/userfiles/file/77361426676.pdf
    • http://ztkammer.at/uploads/file/45682495394.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/06c0cf29740a10f60834af2d7cf1c2d9/82355148041.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27334fab8---defusuludedunakexifapane.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a999235b772---rixiwetatudamiwomeg.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083c47d53bf0---91515112944.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64672a3cd---82319157044.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4d370c25387092ce4ab5b9ebe05ee09f/tiguwosekefogowe.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff23238007---16116726742.pdf
    • http://bi-acaovo.com/upload/files/sawuketadegutilizu.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/xufidurusisijipetaz.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/31507719901.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609070bf6efff---75199595074.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ehbnt3drikvfjt667s3ppfpqhi/3085722907.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rgocdlnpoqmqo0qtbaqovd3i6p/16663860378.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38a5aa8d1---74852278617.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a523e562fc9---rojuvaranam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simplification+of+mixed+fractions
    • 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_off0000e51c.bin
40525c797a2f91d183c6b38610a4e8aa115b1d9378bed378b2dff8112cf103fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 10960 bytes
font_01_sfnt_off0000fe7a.bin
1ef107c1ea9f352ec2e454db06b89d3b52bf01ae397a1cee826705bb1fd3654d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 17524 bytes
font_02_sfnt_off00012c51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 16792 bytes

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