Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5719d0e6c666310…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8b712acdc4093480a071d9e83fb46a63 SHA-1: 06a1a29cd4e4ff4f136486b53c37f4a2822fe437 SHA-256: c5719d0e6c666310a8c63ffc05d7b90061c7f8ec8ad6a222cfb71c8dd4c6abc0
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cncunse.com/d/files/luguzitaxudozeniwigo.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a52b53f4---jofozafebusudo.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/81553749391.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210924220146_lusfwc.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/lotejugopime.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/pemipebowuzumo.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/22758390787.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399203bf7ee---56706502867.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/61716537034.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/furasokavawexovo.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/fumefi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/74368529778.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/vugemojuwozezaxibil.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/57028295468.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/11917866099.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/xagokakupubajusora.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/59763711802.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/xivivezovu.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gitalifaweseg.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/15367078104.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/vubudofarajowokifipif.pdfIn PDF document text
    • http://freestyler.cz/img/file/88441276138.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/rorajexobolozenosobur.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d927e503fa4533c7461a696c93f7523d/24790819920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+warrior+queen+of+jhansi+full+movie+freePDF 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_off0000b4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 10872 bytes
SHA-256: c7c5b2b82b4a15986cd3b8312e54934189173663512d030e07fc3a0408082313
font_01_sfnt_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 17952 bytes
SHA-256: fdcdea932e090bd4ef3f4728ac0b5143bb84f799bf1e71aedfbe7a4ccdaaff9a
font_02_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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