Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4433adeff7d9c02…

MALICIOUS

PDF

82.4 KB Created: 2021-08-22 02:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af9283d791e406762f1ea0e76d34d6a3 SHA-1: 0ee68f2e451646bef1c70fea1ef8b006452d3364 SHA-256: b4433adeff7d9c02193ed502e0764b7a9edd8cc188ef0c5267d7ea4c8c1a00f1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for exploitation or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/16b86945b42735cf9fd87d88cd5b91f0/5223922058.pdf
    • https://hongmao.tw/uploads/files/202108191518498191.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1e1dcfa1a---vuvuzakoseduxabigulesoj.pdf
    • http://omegapizza.net/uploads/files/nenemirojepevudosamozutu.pdf
    • https://sedefartphotography.com/resimler/files/64014006563.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/buo1me4abcc7p9vihde78uc1qt/34774592056.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161012cba89fff---zelafatime.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/71489629257.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/podamifozujedofuvojorarox.pdf
    • http://kahsport.cz/userfiles/file/90520176854.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/49535747194.pdf
    • http://consulcongress.it/uploads/assets/file/38696613125.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/retasenakexevupikudokexu.pdf
    • http://www.pattyn360.com/upload/forum/files/87202037564.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608012c70e05d---lefunuzotizijorevegir.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1a679b62cb123bc0b7e5be8f86a660a2/60552586665.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0622cbbd76---taramaviwapijip.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d36cfef10924cff782f2c68111c191c6/piburogologowuvolur.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wibubo.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcb2546ee---19514463555.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd99a87344f---weralofetubefosaja.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff732726f3---48774362311.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e7f6da7bf3b27295c31d4c575fe53ef7/laluxutapowol.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f7af3a64---soxekunaj.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec506e3b70e---simomodisiboragiv.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656bead869---riregifuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=atomic+habits+full+book+free+download
    • 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_off0000ddf7.bin
841a9b90be8c48b31880a649a209e87d88fd1de3697ea9b45670cdf1fd394b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16980 bytes
font_01_sfnt_off00010a19.bin
68e59428be27664c612c467b265c50c0fcc146799108b06fefbfd3b15eff7785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 11140 bytes
font_02_sfnt_off00012402.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 16792 bytes

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