Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85f8942f0f1013c…

MALICIOUS

PDF

105.7 KB Created: 2021-06-14 08:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b2c1bef8e84995d7096cd4fab70447d7 SHA-1: 43e9605b55132c355387f699eac199e79065e043 SHA-256: c85f8942f0f1013cbfc2bc1fb1505627212b535d4c5b879312fe7e39d3ecfda5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary URL, 'https://inwebjor.ru/uplcv?utm_term=five+nights+at+freddy%2527s+baby+nightmare+circus', suggests a lure related to a popular game, likely to entice users to click through to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=five+nights+at+freddy%2527s+baby+nightmare+circus PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608099870d1ab---fovigo.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/pdh7qg2gom962512lggpcu7jt7/viropusolarugejeboge.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c637aed4d1---82726655788.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xarofaxome.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/nitoluxad.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/fc9a0ecd43cb4c13b2e9f7fe84bfe19a/21740179026.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/966c7f6cda4e4156b0657abbe5104a41/62794649386.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81c69e9bb---vokelanuvifupisojubibadiz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/evjn4144asdpei7b7to9qpjt3f/59007621292.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea01f19ec4---sunewebexelevasafonuvumiv.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/54857292074.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/97474517539.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b29b8c4b---zezuzidejosadikirugebimix.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/75b7c6fa24e7b2c393da4206b9971754/kemimusiwimene.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nugag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 3372 bytes
SHA-256: b3d27ce8ea8c81cd1583623c31a89d1597aea4cfc3735e9a5dc1ea103b107f91
font_01_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 5692 bytes
SHA-256: def6e51ddbb0c757532122be88dfa61d138fcc720006d0e54e4665db7186e715
font_02_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_03_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 6324 bytes
SHA-256: 5a5f60b19c832e806b2568d2a61b94fd057ec3dc76a614a1b2485014795317f3
font_04_sfnt_off00014570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 12548 bytes
SHA-256: d4f6a26fdb901ec239c8c08d54fa859574940b3cbaa04d1830f78400ed6dd3c6
font_05_sfnt_off00016ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF1 16784 bytes
SHA-256: 8a9e9ed1a28af07840b8ded8a57210f3d7c784cd7304294e57d848181599d2f1
font_06_sfnt_off000187ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187AC 6336 bytes
SHA-256: f36c0bbd7db5b3564aa47de08508bf9032445ced2e1969c3706d066501959bde

Open this report in the interactive analyzer, or submit your own file for analysis.