Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f15b5a6c3c6997…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 09:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18700bb6bbefbda963ff4ae7c58ab80c SHA-1: e2add67c0345994c2390f8f0780a9c61e016cd80 SHA-256: a3f15b5a6c3c699763ec525a9a9ce6ccb15424ce05ef22fe883de6c1fa20f723
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 compromised CMS uploads or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=android+live+scores+soccer PDF link annotation
    • http://villalapinetafavignana.it/userfiles/files/mukifojatigoxoviwepabuxo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3745a9c19---tujozewefu.pdfIn PDF document text
    • https://eslms.com/userfiles/file/14198721223.pdfIn PDF document text
    • https://haidangpc.com/contents/files/lafebexetofusezir.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fowuminumiwosokagiz.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/wijetufixugakakutomixoje.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/10892490123.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/57324210257.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/pipoduwoxutuweje.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hkompl39irnao6and7ddopk4oq/11453989943.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/kujebuwi.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/tizije.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/zifotirosebex.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/tiwujun.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/14322443689.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/wesalomidizonaridudebi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613143d08b04c---fupasevanepatijopogofad.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7193b01---nafevujagofilaneber.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/55417102539.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/vulitu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/73111718524.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d8228937de287157df01ed18044fb780/ribaremubos.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 17440 bytes
SHA-256: f4b7fdfb70b891cbdada673af68d1a6f9a4900d8223bfb9b2c1e2e42a7be0e0d
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10148 bytes
SHA-256: fd20c3e1fdcc62d9bef52772590581c51ae29f7bb1f7dee78a59370950bd289a
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1