Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfce2c2cbc718a95…

MALICIOUS

PDF

93.0 KB Created: 2021-07-05 17:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0c1c994c0d5a8667ac350bebafd1a24 SHA-1: 840ff1c527c0499aef2332f41d24310dc16aabd2 SHA-256: dfce2c2cbc718a95bbc2b15ad68fc08df918f81517bc3dee6195c2319c8f5013
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common method to evade security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://notariocprietoa.com/notaria/documentos/files/kebotabunagekabemumapi.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3b6966db3031ab8d2bc3de54e51b778/xufilera.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/aaca3km3rk3vpankbic1k6fm20/95935368169.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f51c01c065d31c8997403f2f08458cfb/76179900903.pdf
    • https://promobryansk.ru/userfiles/files/xavap.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b975a1266cd---78245441489.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/73fff2c64ee9b2d2a36535e4cebe621e/33726185994.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb54e41a49b---39529056468.pdf
    • http://n2nnetworks.com/files/others/fobitoza.pdf
    • http://elementsgogreen.com/userfiles/file/86462422776.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/95398570707.pdf
    • http://aqs-group.it/userfiles/files/memapatusexujewoporevoxe.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af48f1a3df3---ledeberesabeludeposib.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b7n62g1f2cnmusskabslbtt5g1/19277992253.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/93ud1529ur45gk115vmpprhvq4/22479754330.pdf
    • https://bamfieldrental.com/userfiles/file/moxesadeleserati.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/37ced39fc4680b8ff3e1e416e0ac5359/61839290803.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cbbdeb412---pajodop.pdf
    • https://liniagdanskzydowo.pl/files/40971194568.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/tigutona.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5d9c989781b1cb0d123d38eb28bd4e16/55278044452.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/p8ujagcvna14luqnjcnr2jndv5/pikakivuwuzopikibesizefun.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e3b0f95651676792584ce969ed06432/tusabujon.pdf
    • http://www.aluvascientific.com/UserFiles/file/21717629306.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ef53d2664---bexerudi.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872f12efacc---zapanarizivanir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+wwe+2k21+ppsspp
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d1.bin
5111d53ca1e0b7cd0bc28b19484e727f87c1f6fbe249ec9d22381b6cbb22fdfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 10444 bytes
font_01_sfnt_off000108c5.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 16144 bytes
font_02_sfnt_off00011e40.bin
02935c7bf907ddabf1f97b1b200610187247c219182f8169a826eac2f5b005f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 17564 bytes
font_03_sfnt_off00014c9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9D 16792 bytes

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