Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63353d397583df1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 16:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02af5636b57b17637f1391ae391ca2f0 SHA-1: 4bca846608997767f772a528eb3cfcc2d0b3849d SHA-256: c63353d397583df1bbb286417ec17ae56f6c2c220a0e72540fac366314ebeb81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://equalland.com/uploads/File/4909045657.pdf In PDF document text
    • http://on-video.com/movies/movie_data/file/nobemivefirijajobagakupid.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c81d41b0---99513132714.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/lizimupulazowesok.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tbd6bdvu98m0qv7d6qop4t866i/debafekosobovosotadi.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/75575520619.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425bf7e4a11---25473885897.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/18612484178.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pugawunedegiloxi.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/59152294847.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/408368695.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lubejitejejipakawowapo.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/25267905694.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/62266914370.pdfIn PDF document text
    • http://ebus.cn/up_file/file/74244477440.pdfIn PDF document text
    • http://yljczl.com/uploadfile/2021090214482559.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/39098061134.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/38650582855.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/sidozir.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/7702916684.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/nibiboxazalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+screen+mirror+ipad+to+android+tvPDF 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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 19800 bytes
SHA-256: 3e85c276f9566e478bd136c2ba072e1af09a65a172fd763618b69a4d37a00c30
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10772 bytes
SHA-256: 15d90943a85f766d82e89bc738d9f21b34561e7799e8cbcca3d101d9a509a7d3