Malicious PDF — malware analysis report

Static analysis result for SHA-256 19da6e169442252a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 14:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04b1928c77a34cc03e10c33cc68bc8a1 SHA-1: 79972a38832ec33127ea76b28f84de219aefbbaa SHA-256: 19da6e169442252a24ee43347522b2515d2f1bc85055715750e343d565fc34ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hebakotb.net/userfiles/file/xujutaraxere.pdf In PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/senawedituvipuziridoneju.pdfIn PDF document text
    • http://ozari-ua.com/files/file/warelilixe.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/df028482a95342a70c06c350d47b21e0/72113160266.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/nenukexavo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102d5a2a59cd---sozanegaxibef.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1014546e0bdf458d17a72e711bd4e09c/70973838916.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/68953491699.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/192c1b436930d9e1f53582c3402dd7fa/lawopezigufoworevolor.pdfIn PDF document text
    • https://zzhqhi.com/d/files/95639187726.pdfIn PDF document text
    • https://austarpharma.com/upload/files/wizusinu.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/vibusonifijawef.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vafadidogurizunex.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b88022a61---28414281957.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a758a6cc---66879992875.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6f80b053fcbd1524ad0facaede136a07/37994321294.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714545d46c4---bevizirozokatupunixad.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/vizimalan.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/guxopulonis.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d49dd30d97af2ace2061169bfac427cc/94529535216.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16111419cadfba---rutufowefom.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba76e60b4a---rikefibekis.pdfIn PDF document text
    • http://halaljones.com/uploads/files/18224631101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=golo+meal+plan+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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 18056 bytes
SHA-256: 7d2ad0db349d56b24f91a6f4634c1a79f720ae9f8771ab3dbea6383ee43ffc2a
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 10240 bytes
SHA-256: eb0c0c25d6a25d6c72ba9f5b683be616b835b4827ac9d941fe56bbd8c2aa716c
font_02_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1