Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ef0d599b344abe…

MALICIOUS

PDF

87.9 KB Created: 2021-10-04 21:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25c771229de8f18c03c7aeb196f73ffb SHA-1: aa790d5f9512c52857bec0e0fe824b326b0dd0a3 SHA-256: 50ef0d599b344abe829e0546b74cb81920fbc4148ff8d0bf922b8563408e6c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://maryamghiasi.com/images/upload/files/57717472090.pdf In PDF document text
    • http://shopcode.ru/uploads/file/35642606707.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/87524358428.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/fewovewebususadobiluwi.pdfIn PDF document text
    • http://bippex.com/filespath/files/20211001062056.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/mazinivejipubip.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/77344460407.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/26068461667.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/gozapigonalut.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/34431739021.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161562615dbb89---70435255495.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/xegepu.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/fubefarewaxofuku.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/bcbeb228d389fcce12043fc584d2342f/jejuvozirore.pdfIn PDF document text
    • https://taperagi.com/contents/files/lezuf.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631274003.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3d4e3b27---lisekegunilidegomes.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614741b941d42---bavupolom.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf2ae09a59---xaxetatu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0101b281e---mawewuwejugo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/r9396rct6an21v3qlnammgo8l3/vasowerojurusom.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635da75e5c---nemogugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=making+apple+wine+at+homePDF 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_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 10604 bytes
SHA-256: ec8fda0c12779d0bc86114ea554b7befd00ed847c6fec8fc4b9563f190c902c2
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 19424 bytes
SHA-256: ac466c0970e4f80ba0237bd6370d3e990fe0ee61c0189e4ed818819336f956de

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