Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e89e8a272fb81e1…

MALICIOUS

PDF

92.9 KB Created: 2021-09-01 21:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b665ed6970ca7230975131527cf54140 SHA-1: 0211eec96b67c102fccc9e6083dff961efd57bbd SHA-256: 3e89e8a272fb81e1cdff5c2cb4ba121879f002a41fa5de3a4291bc57f1505df7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://medvor.ru/uplcv?utm_term=how+to+delete+from+pdf
    • http://eiak.org/upload/editor/files/4012540199.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964dab4fc0e---39015977444.pdf
    • http://abwingscolley.com/uploads/files/81167733531.pdf
    • https://plagij.at/ckfinder/userfiles/files/86393296798.pdf
    • http://worldtile.net/jangheung/userfiles/file/3964891094.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981520169bd---47252977220.pdf
    • http://zlato-stribro-investice.com/upload/files/47352244957.pdf
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/37891441719.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610342e771c4e---moludufevirobaxiv.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210706015331.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7a6fb793346b3c98c8a4d878f67a0f50/ludomamofavafiwogoduvuk.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ck0d12ocfcdhujane2huh7bvl6/paxolukoridetik.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ccd6db12---71247981066.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b7801417df805734f585ae91a06ac81c/xakirivizewarimetofuse.pdf
    • http://studiotecnicodavico.eu/userfiles/files/15229852869.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d2dffd584e04d869a99575bc46b84c58/65689766659.pdf
    • http://akcjonariusz.com/UserFiles/file/wenet.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d09c97f9b---14253223622.pdf
    • http://zonweringbelgie.be/ckfinder/userfiles/files/kagukakukifepofit.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160890bd0a00c9---fowop.pdf
    • http://md-servicios.com/userfiles/file/8823582134.pdf
    • http://ilovehikari.com/uploads/files/wenuz.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/531jsqlthodj634qdj8v7re69g/96562171494.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/zefowosipatijoneval.pdf
    • 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_off000105ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16792 bytes
font_01_sfnt_off00011e04.bin
d9dd47c388e66ca4912fe43d56a79639a26aa4134b90179a68924aa12d2693a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10208 bytes
font_02_sfnt_off000134e8.bin
dc011bb50e88a3baab72051940f1b5016769a3d493d379c3a943c3c2d657f033
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E8 18616 bytes