Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f29a78a0cf846b…

MALICIOUS

PDF

89.0 KB Created: 2021-10-09 22:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b6aa9eb04508e9866aa6be3cca28de06 SHA-1: b91d1170846a4481c7e764ebdfcffedde649010d SHA-256: 86f29a78a0cf846bbfb28f738320ced2d8b4891805f407e98314a0638f3c5d54
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm on disposable hosting, with some links specifically targeting WordPress uploads. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its phishing or trojan-like nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://aktasmatbaacilik.com/resimlerfiles/93994974142.pdf In PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/seguxeloveg.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8945b4a62410d9ec85312b8303ca450f/korusemetut.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/21987585299.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/lrvk20adji9qq40ttrrvtvpcvd/moramazizus.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161536ae92ce92---rizojuw.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/taxilomitovovev.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jipomitol.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zitokowodifemivubes.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a7523d1ce3d931ad434b134ab655e512/2373624165.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/89683478047.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109190018577589.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/jejesi.pdfIn PDF document text
    • http://allycatering.com/userfiles/92784774502.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/90997900884.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/92891911594.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///84468352322.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/vifugazavadaluleduj.pdfIn PDF document text
    • https://yasacompany.com/upload/files/nirujoxuruwuxo.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/terasa.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/wegitulu.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/keluxunekavajeto.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/lusiwulofi.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/73157689684.pdfIn PDF document text
    • http://www.pvvc.cz/files/sukaz.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/wegutedukiliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=enchant+with+mobPDF 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_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 19200 bytes
SHA-256: 88d59d93bdd4ac90bdcb034f76d78a50a9b736dc10851585d8b78aa1cf557bcc
font_02_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 10256 bytes
SHA-256: fc426d6c04ec9a1d5a8143aaed73bdfd1214f0fbe0359ba332ac64e61f57dacd