Malicious PDF — malware analysis report

Static analysis result for SHA-256 df08de7b82876e94…

MALICIOUS

PDF

149.7 KB Created: 2021-06-23 02:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b394f241a7149c048889013ab597d3fc SHA-1: f400186296bf3aa52e86b81ee8559ccd4d6e9aa9 SHA-256: df08de7b82876e94c5d37f231cc6e976dc1d608e0cea4effb9d843389ea7a8ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging a compromised website to host a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608887a3086d8---lumupuxemojemagorojajek.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa935c785a---17615913741.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xofonopamasotebumodasu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f12f7bd781f38f73355a9006b91a0f32/zaxogijifawasatidalulajit.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zabinepumiwotegijozadude.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/85n37ltb6c4srf01mj5jptrf3h/84976540525.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/95135104811.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867a844852c---85633603043.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fabopijoxeti.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c740f88c01bff4d25a853dbd5cbc85da/13086643184.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0406db628cb431f3c02cf2e05bc7f87f/96412512613.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jopulalizirajipusib.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ba263930f060d31d6b915040a0ba4478/19599364897.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/rojisowotiduzepitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lesson+10.1+practice+c+geometry+answersPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00022d1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22D1C 17924 bytes
SHA-256: 506b478210b9012121248aa6b1e1329a92564c6ac215c94e361959d543c512ea
font_00_sfnt_off0001e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E762 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0001f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1F0 5584 bytes
SHA-256: f6a90cc193b0be2637ef8ed28d2f4955e6cf8fea5b1db04881f73acaa6f91cbb
font_02_sfnt_off000204fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204FB 12348 bytes
SHA-256: 6fb5ea805789b87fa9b7b4686bd1922b27ce84fe951e81945d8f2c75937fe0d8