Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55bca7cfc5dbc16…

MALICIOUS

PDF

98.0 KB Created: 2021-10-07 22:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc8ab64cb827e77fcfc4587195f1db0e SHA-1: db29fc8435b2a498c2f3aafd2fcaec3bd9e050f6 SHA-256: d55bca7cfc5dbc164f1c4427992af45ace2208756553fb645a1d93b9c0a62fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=use+of+a+and+an+worksheet PDF link annotation
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/91136612069.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09372e9b0---fexesufusurad.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/3096395356.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/16968531153.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/vaderadot.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16144f7dc4cedc---pezivataguxubisugitali.pdfIn PDF document text
    • https://daotao.cungthieunhidanang.vn/app/webroot/upload/files/98215688757.pdfIn PDF document text
    • http://uteambio.com/upload/files/25394695444.pdfIn PDF document text
    • http://jsdarvin.com/files/mokezi.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/titizivemonep.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/32729247355.pdfIn PDF document text
    • https://profm.hu/files/file/97242723306.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/vetovisawamanopogo.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/48913610338.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dbb9c4d4a---nemikotonunaxazugat.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/39802554475.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0705uk81m3gueloucsbm94hqb9/logazipanulujipeb.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/nepodepewivejekebabo.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/14577870594.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d82fa927164e662bc1173bd07315708f/88321036360.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/kiburezolen.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161339bd41a794---84075012934.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/13206494790.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/97121813198.pdfIn PDF document text
    • http://teakdeck.pl/files/file/81491795335.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_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 20628 bytes
SHA-256: 12959ea3352bdbb8320d808ac09767898c46a1c9660580ecf9d555e0b63bff50
font_02_sfnt_off000162a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A3 10496 bytes
SHA-256: 0aa7777736b821ecf6e3585944f54343ca4ec36202f8a450b3bf9bbe374c5733

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