Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58cb31b7b4d91d2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 14:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee07c0591684fc7d1d4091072273d50f SHA-1: c0845351619ba4a99e9441fbdcb6106ad817b26b SHA-256: a58cb31b7b4d91d298dfd4e2efb77399d8d03b15f840153c6b384a38f5ef32c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple links to external resources, some hosted on compromised CMS platforms, suggesting a phishing or download lure. The presence of a 'download button' heuristic further supports this, indicating the document is designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ijmsir.com/ckfinder/userfiles/files/jekukokibokazerinil.pdf In PDF document text
    • http://jamxmpharmatech.com/upload/files/63535981255.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/winekutiguzi.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/lupomumini.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tevomepa.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xivefibuxotusat.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/tologorosisosonumaxu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613415f142988---pakejarupapagobeder.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/xibawibulinefono.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/91690896450.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/66120015437.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/55474428434.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906113037751666823.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/68124292814.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/58209281007.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/lesebexebatunebikufo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a7ddcf5827b63a1cb87cad848aa276d3/55532759686.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/fetafatefum.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/muferamum.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/de0d743e6325cbe898c75c8fb4a251cc/75857174074.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6g104cqgt7lqo846jb8c1pq296/99283695174.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/kazavolidokijokavu.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/31860973203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+hill+climb+racing+2+cheatPDF 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_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 10996 bytes
SHA-256: 40f3a50e5e8006559b948d61bb777b01c2fc18dcf602cc2716c34a2a6e587bdb
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 17728 bytes
SHA-256: db99330c8c69dd9c48ac523eceb3782af92bd01bb42f5448dde947042d58caa4
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1