Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0cc03732260819…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 04:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed841f168c4eb3386ba3d07ede947146 SHA-1: 7fb6c194979572ad21ab5892b75a90315d079c1f SHA-256: fb0cc03732260819ce878cfed25f70262c5c4245d353a844825e177f40b9208c
172 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, some hosted on compromised CMS uploads and disposable domains, suggests an attempt to redirect users to malicious content or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://studiobaldizzone.com/userfiles/files/vixoxefesagevom.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6a8b91ae237dad859479bf7f4375478e/napadisixalitubi.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/1195266962.pdfIn PDF document text
    • http://portableandcool.com/files/files/94101154555.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/muziwimig.pdfIn PDF document text
    • http://flexa.cz/docs/file/kaviketobapevejuvemivaxaw.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219773391809.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bcd756b8---sefesojosazivivupipegoja.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/76942440114.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37053dc7b---zezubolugij.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/jenotikav.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/0811200731.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73f9b92f0---vatokoluvalarenebu.pdfIn PDF document text
    • https://successalpha.team/upload/files/55117636418.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/1333353898.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/28560323868.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/dawevoluvojotazunipisa.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45879103750.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ledugosuvisamoviv.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/japufinarebak.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/vujidobalazulisesewosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=apk+temple+run+2PDF 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_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 16988 bytes
SHA-256: a753950b7ba48e08fa51b25ec6d6fbe800a87a31bc6167583c1be5de391cbac8
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10164 bytes
SHA-256: bf73a5002d51caed9ddcd3fda430ce706876a93ddfcccf6f76e7bd51a60a5095
font_02_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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