Malicious PDF — malware analysis report

Static analysis result for SHA-256 b581167cb2c265be…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 16:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7043e1104f1ca908d11ac70dbaba845 SHA-1: 4eb709a27b819302119f9f471d72a5d045c73ec1 SHA-256: b581167cb2c265be706ba34d287d02848c4a85670813fcaed1a23e3c47f8600d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or malicious redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=ant+man+and+the+wasp+torrent+download PDF link annotation
    • https://mgs-on-track.com/app/webroot/userfiles/file/86126256572.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/lojajizewen.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/benegapiwitizoba.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/55853736642.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3dac717b---murewazeleku.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/79128834874.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/zokigizaselifazerizegobeb.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/lubuvijasun.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/kinasi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sadela.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/remuzamodamafusoweben.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/xusunopag.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wibusovaxojori.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/73529988442.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613556a99a22c---16943954366.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/miluzemuwarupafibuvov.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/38424302730.pdfIn PDF document text
    • http://skncn.com/u/files/85654699384.pdfIn PDF document text
    • https://12shio1.com/contents/files/ditipifunanote.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e23accdf---82616347476.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/bokamupuxivebi.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/33193920524.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/tiwolawixikepasiladabos.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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 10632 bytes
SHA-256: 40e4f20444a82ebddfaffe93f0b48cb7688a18b29cb514df23f0a0f1bd1de352
font_01_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 19392 bytes
SHA-256: 39001db13975a7d36a704d944c0d9c2991896da94f1201b1ca8ab26650327a97