Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53df482156888c2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 22:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77a149c6e64e32631d0d68aa14eead16 SHA-1: 92f7037d9ad0284c0fe6c5c615eb8587646ce54d SHA-256: e53df482156888c23a254f1014739b5f094716de11d8ad9d1425b49f4fdf01ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mimpidia2.com/contents/files/tamejubamarevatowomevoxa.pdf In PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kuruzugujoduxibuko.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/6214907390.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/87371918085.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef20a7fc2---falazuwefazataf.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/92660559730.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/semikopujadosizubo.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202108311721552936.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/92240074228.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/15242715415.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/verupiresogunova.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/28031178510.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/gelisej.pdfIn PDF document text
    • https://flomogroup.com/upload/files/23408681910.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/34466152900.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jujizasomukenilaravoxap.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/50904411111.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/39908099594.pdfIn PDF document text
    • http://exima.kr/userData/board/file/88906909958.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534ec3b5cb---vofimeriwuvo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3cgnkb9ec1f24heo3s4mip1knv/bogeno.pdfIn PDF document text
    • http://contextuae.com/resimler/files/29056092146.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/37751543532.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/jarumuwojofod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=zula+mobile+apk+downloadPDF 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_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 10568 bytes
SHA-256: 37cda6358ffb47c3693148da5f346c3cb51e77ee1a63b5f7a8ea346289245138
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 17512 bytes
SHA-256: 8c2a447de0052efca5742f319978e3ccc03a1d0b7019f7ec09ece31c5f3baeff
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1