Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdfa21f406cc994…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 22:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16ab57feb516b447c8b798e4407d71ba SHA-1: dd40b9cb696463ed804c720d3d5135b979db8028 SHA-256: 7cdfa21f406cc994da58f7cad0b59aa3f4669330e5b0398ac07a183313433d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161326fb50be92---7288623590.pdf In PDF document text
    • http://v-lukomorie.com/uploader/files/96824251634.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393ea8ba9a1---52083311772.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6dfc40c5cdb8b94e8491485490000935/gixuwiwifamuxosagurilup.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/03d9c60660227f0a479a4d93f5aa13d0/kejot.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/nirexiwugokasavimatugizan.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/34351976187.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/minenopugeratagefi.pdfIn PDF document text
    • http://e-hematologica.com/users/file/zixatapidugapuj.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/niduveratetage.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8650d3d17---68473942675.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/marenujedilitezikebir.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/bikazibanewutawolexudi.pdfIn PDF document text
    • https://tdfstore.it/file/44238544357.pdfIn PDF document text
    • http://allycatering.com/userfiles/gexudovereb.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/sujolosavusabilaf.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/78f1259fc2cd6b8a4fe8336ccf7cc0b9/zafenagowojejalexunufebo.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/64006007434.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/29618702675.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/84149726953.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021923458588772.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483536b43d0---64924671145.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/vugifapevajopamobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tome+of+battle+pdfPDF 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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 15508 bytes
SHA-256: 55d5f7c4039cb8ba85ee8a4fe11e11251a4e2eec2986959e3f719691d6affa30
font_02_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 10296 bytes
SHA-256: 80f138cfa62d64695e815f7d39553e5287b9ec70fd0707d5c5dd4d0c59ce4d1e

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