Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b77577135feb13…

MALICIOUS

PDF

77.6 KB Created: 2021-09-24 10:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4906f4693f1e803e3aa3e9ae676a5494 SHA-1: ec1535fc5823c55082066949437a3ec68c913ab8 SHA-256: c3b77577135feb13abf84920df2a115ea9f74066206fc1d4d657d0d80e3173ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://unaizahic.com/Files/files/rurelokiw.pdf In PDF document text
    • http://sinsg.com/files/fckeditor/file/gegitulezawofijote.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161451c0f10a32---netifevav.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/78903544132.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/nirenuforudogelukibo.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/3411112554.pdfIn PDF document text
    • http://torgoborud.org/images/file/dikirugupaxadavunejuxipop.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e88f652---vozosumota.pdfIn PDF document text
    • https://mbbs.hr/files/ganowos.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/18698277515.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/kusizubewofekaxidijutup.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/65706899669.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/22354259035.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/162cba58f35772c0cbc97ec429ce801f/xabejara.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/mofijudofikisozoluteme.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1892a3161---pikowigevugawebakexa.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/munaki.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/76162102556.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/49431410867.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/kiturixaluferovadepidev.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/gojejaxaragib.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9f3d535eddec40cc0b249358fa858f0d/danujuwoberif.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/11248987104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+giant+within+pdfPDF 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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 17472 bytes
SHA-256: 1e3c9d11af00e9cabf6d5ca3460d04eb3dbd1cc62e576781b8bdc5ba4bfde526
font_02_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 10392 bytes
SHA-256: e4db42b777a959661262197a2ca379cc87514ae1737acb7562aa3c074b1725e6

Open this report in the interactive analyzer, or submit your own file for analysis.