Malicious PDF — malware analysis report

Static analysis result for SHA-256 89366a7e29857f75…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 07:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 559d415d799aae45a184b414da6ffa92 SHA-1: 381b4a6262542e6741e62dff9b0087aa644fad6a SHA-256: 89366a7e29857f75da13d8208d8946afedd0570862365094e9399b14786db91d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common image-based lure, presenting a screenshot to obscure clickable links. The embedded JavaScript and numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect the user to a malicious site for phishing or further payload delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=abc+123+movie+website PDF link annotation
    • http://ned.ru/uploads/files/gotadexet.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/11279676855.pdfIn PDF document text
    • https://divinescience.in/userfiles/file/nonubosoxiwomevitoj.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef7d6026c6---derugivujonezogekokevuga.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/witonopavozan.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/57494752637.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/89899076000.pdfIn PDF document text
    • http://langmypham.com/luutru/files/90173391986.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/1890848822.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/lebirapekitazoxibobebu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfe8b7cbbd---volabebimesizoruj.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/61c8fd83a656ffa992700d8888e1eafb/matinaw.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/diwewi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/88396392155.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/gijudevufaxupesukefa.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/fotisasaniroxidabu.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/12347645648.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fikuwibavabobagewo.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/91850764757.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/mifoz.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/57681492513.pdfIn PDF document text
    • http://webursitet.org/Files/file/wuperuxogo.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF54 10596 bytes
SHA-256: fe46efa66e995463b3d511c2cb270fff7664f665eba4b587eb0bbe3fc9ee8af1
font_01_sfnt_off0000c7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 14104 bytes
SHA-256: 9a1e4bab37d30a8c6019be530f51c240e531b71a37a9eb070b03dbbb5cd34ccc
font_02_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_03_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.