Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb378e12efe9410…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 02:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d03e72edc0898a648496ef6344a15994 SHA-1: 73d26fad0212118e54ed4325e4dbba0d9f98a760 SHA-256: ecb378e12efe9410fbeefcdcf448dd82a2472593e6cb0279558c24d82d268160
164 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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 https://archism.ru/uplcv?utm_term=android+1+angry+birds PDF link annotation
    • http://nedirajtebosnu.net/userfiles/file/28298537602.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/97059836878.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/14584c319965bf89df6bd8b66fb25dd0/vatewomufilu.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/dakexumetoli.pdfIn PDF document text
    • http://cartopack.be/Images/file/49714779153.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed042a8220---xizod.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/84992319360.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/14710982226.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/fikexoke.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/49876434716.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/nitaker.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/farixa.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/45682231305.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/96737198785.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/dememolubuzelo.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/81295659615.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ae409295---31261862156.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/gujopizunepobebipoxeno.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/21727440480.pdfIn PDF document text
    • http://dsraxys.com/uploads/walubifeje.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/boboxotisuwelejigi.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210901133053753.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/18441491502.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 10436 bytes
SHA-256: f79f18cbfed850510644c75ed538447ff46060b50344e5610d1977cc3bba155c
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 19308 bytes
SHA-256: a0d5cc17e5ac494ae86015f7a9b0f420e13b3525257e346051e5c5d32fa5f756
font_02_sfnt_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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