Malicious PDF — malware analysis report

Static analysis result for SHA-256 61598ec5982f5812…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 19:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8570d4da3dbc55f453cba9d3d0d9f130 SHA-1: 65b77256a91aa3d5996443c2920584528d455b32 SHA-256: 61598ec5982f581203cf41ea019e8b5bf798c4212c09a69502c7e44607560b45
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-only appearance, typical of a screenshot that hides a clickable button. Multiple URLs are present, including links to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/xexizisupefu.pdf In PDF document text
    • http://www.chubsorn.com/file/files/67068006589.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/netuxusupumi.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/2146318671.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/90199091009.pdfIn PDF document text
    • https://desco.scp.hr/files/xizufutujogu.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kabuza.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbe20d27c---saloxexotigefopodepakivob.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/53675705002.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/45133513747.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/buvunujoresobat.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/mawoda.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/75945399598.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/18572661270.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/detid.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/goritawazugisaxifan.pdfIn PDF document text
    • http://video-cycling.de/files/file/27906586636.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff919cf2db---21821700555.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/nilupabeki.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/fudawariw.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/47119307077.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/xusatenejuvewuviguzubi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a57a56f1e---48687140317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+emulator+for+pc+free+download+low+mbPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210905/16308558933155.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_off0000b261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB261 10920 bytes
SHA-256: 12218403df99f4f6de2bff3bf28bb284b64a486b2e9af074ba0c8757941e536d
font_01_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 14204 bytes
SHA-256: 51148d3c77467fa99b3a817b5b4f769049ed9c914aac4c116d299f10318cadec
font_02_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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