Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdb47aeaca8e323…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 23:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d23feb3607eb4f6b4c27e5530a2c4c9 SHA-1: 9edce74e5acc00e2228713655fb23fe40f2844d2 SHA-256: cfdb47aeaca8e32303bdec8e579ddfbd9af97049ba065748809461aaee2e9507
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many on disposable hosting, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=itv+for+android+tv PDF link annotation
    • http://megaprestige.ru/uploads/files/30387586738.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kiselotinu.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/86295920228.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/33216509865.pdfIn PDF document text
    • http://creationart.hu/files/file/xobadarizitekabezef.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/kegizuxavevipitolo.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pikunajijitasaba.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tiwaxotatejofoxifaladixi.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/latalitijopajafurife.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/6533511547.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/bepifobikuzapisep.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/47326891432.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/tadenimapugogovoxajoro.pdfIn PDF document text
    • http://iscelenie.info/files/file/73848436570.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bhr7cs1p9mnhmqn3r1aj28t7nt/vivuxeruxofoxugojupojasam.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/86691005553.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/52488899233.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/fowifusinadurabegamu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15b35eff2---2970640006.pdfIn PDF document text
    • http://konberdbio.com/upload/files/niposimijugonipe.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ce7e582e---bivuviw.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/mogagate.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/gegipe.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_off0000afd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 16836 bytes
SHA-256: 9881bf64c0f85bc8aaced9a15f74c1c69d81a5697b9cec1983b0e0b25fab77a9
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 10020 bytes
SHA-256: 214892255b010e58088bf0ecd6d21ae1eccca43369cc8085a9ec5be3ef6cb9d7