Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6367faf256d0ab…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 20:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91000ba3f1944f837defb03068e90afa SHA-1: aaaf997afd7273666beadc5193803180795e62cc SHA-256: cc6367faf256d0ab713d600c583f2ac9fb2458753c5bf05dc8f2120ed09213a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to external, untrusted sites under the guise of providing software or other resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=windows+8+activator+offline PDF link annotation
    • http://eaas-journal.org/survey/userfiles/files/779553270.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/lujizelefiviwimuzenurega.pdfIn PDF document text
    • http://tavio.su/files/file/lalugititufenidip.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/74499244877.pdfIn PDF document text
    • http://toroisg.com/public/images/files/zuzulefukemujiku.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/suwomewanuzowusid.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/95821943896.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/34065498965.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/731e67f17ec66fbdc2a7f5b8bdfe43d6/93263675771.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/5040442601.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/ruwubuzapedite.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/88104271358.pdfIn PDF document text
    • http://kahasat.cz/data/file/vawepire.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/cf0aa7e7d19c6197d0d5ba8df3538747/pexelanina.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/taxosukasova.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/fanarotuz.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/72204706008.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5cb12aca---49507924385.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/kalorag.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/73673960417.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/31084931766.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb81960072---12456618218.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/13260099461.pdfIn PDF document text
    • https://invest.pl/userfiles/file/nojuju.pdfIn PDF document text
    • 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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10824 bytes
SHA-256: 1872e88b50473a158c70d17b360d964b467a6d62238a6e999f50fdc260a35528
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 17512 bytes
SHA-256: 280dadd0bf0256661304ebf19e1ce131c4c028a74ca1628ebbb8deba74fb2953
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1