Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44e40c4f0dbdfcf…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 07:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 804fb1ca0e6aff8b92ab9e05fd0b8017 SHA-1: b8f0eb1cbe035cc2ac57c32be58f2c8adfb737a3 SHA-256: a44e40c4f0dbdfcf691a34521dda24830a82c4940018dd3a5942e972ed9215db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm on compromised CMS uploads and disposable hosting further indicates a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://acavacecio.it/userfiles/files/34440973717.pdf In PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/94508103435.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b9a6b5228cdd144eb6ed12f976d30abc/60500406363.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/9105815908.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/47475605343.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/10579346044.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3d90aea1ba42625685f34a6fd4a95e02/lazotami.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/9803235477.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/semuselonajizat.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/73101998729.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/netebopidazinerutenobif.pdfIn PDF document text
    • https://media-get.com/userfiles/files/43086959580.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/73770623322.pdfIn PDF document text
    • https://titishop.co/upload/files/rafovofowila.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/lovixuninugaguwajiroda.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/nukulaxadevumiwuput.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/76940781378.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/73107187784.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1cfc8106---tifezidusizarulalamopuwag.pdfIn PDF document text
    • https://777mto.org/contents/files/33984236410.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/47303293202.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/rirotikurotub.pdfIn PDF document text
    • https://777mto.org/contents/files/31663352382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=%D0%BB%D1%83%D1%87%D1%88%D0%B8%D0%B5+%D0%B8%D0%B3%D1%80%D1%8B+%D0%B4%D0%BB%D1%8F+android+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8CPDF 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_off0000afcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 17088 bytes
SHA-256: 132267ae4ed455e6a1628ea221a3405299ec33d86e89ab986ea357a70e8215d5
font_02_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 11540 bytes
SHA-256: 4f9cc72d828ec69cf3484075ac5a117203abfd1e6e72b1a772c8a0fa9fa3d217

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