Malicious PDF — malware analysis report

Static analysis result for SHA-256 5511e72985d6c7ea…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 13:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fb87d64b6c0baac839194f1339504788 SHA-1: 30974d6651e15e591a9efa34464a625faec6e70c SHA-256: 5511e72985d6c7ea989617d8a062c04b4fa09503b1ee05e7ce7e1650836eabb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, a common tactic for hosting malicious files. The embedded JavaScript stream and the presence of multiple unknown URLs further indicate malicious intent, likely for phishing or malware delivery. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9u4mqinssbbanso0vne9i7fba3/fojozenixelovazapar.pdf In PDF document text
    • https://yourwebcenter.com/files/file/37167851181.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/jivewajezijefiseza.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/tujodolidibiganakelofu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c30169415d209bac3fa5f95d41a398f/31416440707.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911192901.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/toromimis.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452c31e244c---wawubukunekemudesakawu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16148ef2fdfc79---93945744761.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/madurivudomoxaxaketas.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/48f4e15fbb397816dbd3df6ffcbce167/39709947410.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/lerixufuxunugilekamifisev.pdfIn PDF document text
    • http://glassick.com/userfiles/file/59863102829.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3104bb30---miwavosijijabuge.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/94364824697.pdfIn PDF document text
    • https://limsurdua.com/contents/files/48286075582.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/27878842959.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/26904446109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=class+x+math+book+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 10700 bytes
SHA-256: d56fbc7409ee7a853ac4a37076f5546c91dec5aa869be9099ee005a7ba295545
font_01_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 18496 bytes
SHA-256: d6244ff8c958556616bc5e7355b15ec9e6e118619aa66dd245a6d2cf04ebf729
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1