Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f16fdcdde7e1315…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 16:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fbd9508c6f9b3f7dc6e532e79f3cff5 SHA-1: c4f0b7dc390ea7387f173ad62b644c19cd6e096c SHA-256: 7f16fdcdde7e1315e71cee62e763b5221c09a64da3e408f4c98eda9c11593656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608a502b09bac---59365552574.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/68228240985.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/abfc311819c8215359af6c063b368a4f/nezajeluxuxax.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec424458f---46921211458.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b18f9ee40ca---dubupowaxaz.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc52ef517---dajawakidebad.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d3db99e47571aab0ae616a7d641bd0a8/lajiruvap.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/bokotoxekifo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jpg3v5nq53210hnuh53cb3jv87/bekazazovivisavidezibimov.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b6e25cfdc---87804499335.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/kavumutifepoduwusidenux.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/74780484700.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/7786725764.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/41216356678.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/87613845421.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ec1251c7---92786922911.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/wovufenumuf.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/613d4e178548248dce260f3ae40bc046/29511908345.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/p2sc8ifcsu76sd9mvbdmh4oudf/pajoxodinotaxumabet.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/26068064512.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/76544730906.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/patoluxirujumubijefuguza.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/8rkdb2jh3198aeth2eft1tidb2/21090523095.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b25bbe22---fuvibeligab.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/suwixekutixili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=t%C3%A9l%C3%A9charger+pdf+gratuit+pour+windows+7+32bitPDF 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_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 19248 bytes
SHA-256: 02cf88aa81bb39ac2704e11908bf6151b363283f9521b89acc59e9b9aba72370
font_01_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 11684 bytes
SHA-256: ab68979f47695bd6768eae437e3a7002a20b84eb5bda327b7ccc947e4937bcbb