Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08f4827aeef7ea6…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 15:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b046c06e8ae52e324cc1f5d65bfebb7 SHA-1: 4dd1963bf4f865579f1d10e29ff1894702445d8b SHA-256: c08f4827aeef7ea6f129558f9b32220ca9648c67f92950aa2ca6ed78d3182722
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external resources, many hosted on compromised websites, indicating an attempt to deliver a malicious payload. The presence of a visual download button and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://svatba-emi.com/uploads/pages/files/nibubijetoxo.pdf In PDF document text
    • http://steakclubhn.com/campannas/file/19819575055.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/93760313373.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/vufibabolijefawik.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tuvujidefitotom.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6c7aa67f0b35f0fabcc11f6083d0538f/xavejijazimerag.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/18448794988.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4f96eb100bf9958aedae8ed1b2b8776/lomifiroriv.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q6unethpalkbn1k1mca6jgeja3/63658723160.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wadixokulonefewinukaben.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/tivositunasexog.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/71432444003.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/76753817487.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17621e7c5b---rowugenukeluxapazuvogewu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41318774777.pdfIn PDF document text
    • https://777mto.info/contents//files/worejupefituvadevat.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/jiwalusatulawi.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/semakujaga.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/xofera.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/lageziz.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/fijetozekukivore.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/60802893077.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83e8953c1---lurozizixolobulamapivofok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mxq+pro+4k+firmware+7.1+2+free+downloadPDF 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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 11176 bytes
SHA-256: 154f370b0ed4453a389df341ab7453f952fc794014aa46663b55e28d2c4c6fb7
font_01_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 17684 bytes
SHA-256: a8adb42a28df91ce9300760f1ff13fe370abff053d4ed6f94c2d0120a2139b90

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