Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a5589fdfacc796…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 10:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c255e42fc2c4c63aa1815299d3ce4af0 SHA-1: 28234efe0c6ec7ba39e45f44a358e331448383ae SHA-256: e1a5589fdfacc7964613050c1b9b36eb71d7b716667f65a28151e84d3b4f82c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://777mto.com/contents/files/revebajimitivujokabu.pdf In PDF document text
    • http://heorungminhphat.com/luutru/files/93984608852.pdfIn PDF document text
    • http://naviway.su/upload/files/46942294972.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/89881381506.pdfIn PDF document text
    • http://hangquangauto.com/files/60958032575.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131979a8d30e---61736802094.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/dijivawu.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/99212479900.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/79697273689.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/lenivetivulufoxanuz.pdfIn PDF document text
    • http://delve-cr.com/uploads/boligowek.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/62296358965.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/3005757325.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/gobamag.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wukorigowelegijo.pdfIn PDF document text
    • http://precisao.net/files/files/netenija.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/divum.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/93769860231.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/44484949347.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/88b8f9c3d7f485ddeec8226a7d500677/85631473437.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/rubalubajurosa.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/xowuvumujumaxibipul.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa31a0212e---76702014105.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/rowubavumexivokuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=123movies+high+qualityPDF 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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 16516 bytes
SHA-256: 6be0cff1eefd2f25822ecd7347c45d6846b733bd1801f4f1d78afa42c91285f3
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 11024 bytes
SHA-256: b8f54a1e116978861c5c382df395c85fe4efec499f5f9bcc2c5fef1ef543f369
font_02_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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