Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a971092d256c7b2…

MALICIOUS

PDF

91.5 KB Created: 2021-08-01 03:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53c0db7a067bb36a4be80de8c2c59329 SHA-1: 1809169a50b792c3f1b754392593f76382091cba SHA-256: 5a971092d256c7b257600b07e17079caead535124844d35197353924fb926d01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6b3c13804dbd5a5890ecbe6eb13144ab/jegaxesolexo.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6pgbqe422alo6dug6h9qmg6pm6/panulebiwutekanobej.pdfIn PDF document text
    • http://fteq.ru/files/file/loregapus.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5025124ad---39466711670.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5ljoaq6lknoukbf70sqmn60ph4/lanurogumemuvef.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mck3g9nas0jpel38sg9prvhluk/42268945240.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7d368c83---vazugif.pdfIn PDF document text
    • https://ancoraeducacion.com/images/39496978469.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513032e082---9420580466.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/84535925513.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mixoborex.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/av3h5co5tr41jvepffbkpiu3jq/63403832407.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac2234e15---jaxobipijitize.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/vuxuvavigukil.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e109fff973140035a339f953ef0a5fad/70504098567.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/kevewezoruwe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa0463c66---40887069863.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/18799236488.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607487483a930---20287464207.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/gubawozabenipexa.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/5529191827.pdfIn PDF document text
    • http://elma1.ru/!upload/files/89507419296.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c44eeff4---putebavoge.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/36331490221.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c875e96ba68---lewufazinukinefirel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+does+the+executive+summary+of+a+business+plan+includePDF 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_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16880 bytes
SHA-256: b9192da1178025d452be5c2b054e8e507162f8dda2abfc7262f6d7773cce4fe0
font_01_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14467 11400 bytes
SHA-256: bbd7e084433af550faee71a2ca178187fb056aabdd02fd2508192359ae1cb0f4