Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b309586de401ed…

MALICIOUS

PDF

98.4 KB Created: 2021-06-28 09:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d63df6aae04bb81409c1f273719ef2ee SHA-1: bf07adec615aa9d8cb1cf7f9a9713f6c94966fcb SHA-256: b5b309586de401ed522b28d9db0be35de8a310bf5c5e885bddcc7746d5403126
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to host phishing content or further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d91c7908faa---38161192526.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e04b4b6eb---23133945854.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a0dcb4qb1ppd3nbp4a1rd440q/gugaginekugusogixukuwox.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160925cd087e04---4141175809.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/83185800494.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/abb1552b05563993727d863f04ce07f0/34439314028.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b82a747da---81986515751.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7e5333d2342f25e581f7fda717698ef9/borumujoliroto.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/dagexirebosokedulazaw.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61eae88a88---kebufewen.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/54859314283.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160956dea68ef9---74264421648.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/04f151927163422cc0992837531d4bde/8082951627.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6dd19dh21dg0hm1bbooraqquqs/dositedugisab.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6jnb0r45v8m9ppt1lu4n3lbu2n/95748406831.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/41271663882.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/17083706387.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/36982918969.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/mixigupomigidaraserip.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607973a4d280e---82012108889.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d6b11d117---20490475086.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/rqjb4bg4q2rha5tkbsprdi31k6/28963226308.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608501a0f064e---texarilarosiludisa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f7ea7a318ba1cb6d8318f4d9dcf98f08/bejasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=find+the+prime+factor+of+12673PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 16996 bytes
SHA-256: 712cc2cf0f00d7e122551edfe3a4143daf8dda962a9916dbc8a368a984b8c7d3
font_01_sfnt_off00013410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_03_sfnt_off000161c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C7 11208 bytes
SHA-256: b327e0eb9966ad52c655cdde344f37d9675e160a3364cfc54b0c9469e72e6d0e

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