Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d45e584af62f12d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 13:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cf3b971c73f2cd93da3e33d678f7862 SHA-1: 67360b92d0ffc7ee1c84b683001c5af6074e6981 SHA-256: 4d45e584af62f12d4decd6ac6d1d7747d6dd623f46981f7e08c8969ba64295e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://educasters.co/ckfinder/userfiles/files/vogofutitafegobuxaxajuwo.pdf In PDF document text
    • http://cocoabuterol.com/upload/files/29746524847.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/worokep.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/12832970172.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/tonepenapigubisisotek.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/rowufetuzalasowuva.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/57327771030.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090818021111904.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sj1ki6ulgat4j91h6549u3j4f3/78222063508.pdfIn PDF document text
    • https://insp.biz/img/file/bowisetamaziwevozefur.pdfIn PDF document text
    • http://gibisch.com/files/files/40451632020.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a62f8dd335a8c9e133078f826282571f/412220524.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d223062d61af24474f24c02bbcb887f3/dusafiwenepo.pdfIn PDF document text
    • https://terracell.info/images/file/zexazum.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/56480634843.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210914_19_50_43.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/xorodogebuputowalu.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/nowakapelikopusukewurew.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/senoliziluvixuzozadaja.pdfIn PDF document text
    • http://shophouse.info/images/files/25490970956.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lezutubosota.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2de2a140---pobobuzuwebabuto.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/57230123560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=coc+free+gems+no+human+verificationPDF 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_off0000c230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC230 10936 bytes
SHA-256: 519303ad6c1a8c4ee779dcac83a3c297ce58082f4acb9d97868f43a73c47c50a
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 17648 bytes
SHA-256: 88fb29abfe59dbf858fc1a1df1f2a2229c1d5c4fefefdb0c8c2458c484a34075
font_02_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1