Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcafd312bc659659…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 20:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 383a5c453d772d31509ba00c456aef3c SHA-1: 32faa615df44dde5873024b9c1d3bcb47d6da392 SHA-256: bcafd312bc659659e76db23175513627bd061558d13d13d0b7a395c68584d3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9c7d87eb73e8df3397ade2e27af4a878/jipelesusalatexewawo.pdf In PDF document text
    • http://sunrui-ti.com/d/files/wilununovimu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d8a7cb74---kudaxufipisutosobotomak.pdfIn PDF document text
    • http://chinazzjx.com/d/files/49553179461.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/povutujanujukitugesawi.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/dufasetakebamixipojino.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/05737b3ed87a005a8ad1af0ff926febc/vujez.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/92964681014.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/makigilujuvo.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/95271794295.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1u6efc4scm6dq4gash85fpae72/86527170183.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109071508272954.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56300477263.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/wikonuxefuxibarejuga.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/15031292939.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/46857481054.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/vepuwonoguga.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/40719369951.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/mililolupikufapevinoxitoj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613205a2ab7c2---lejufopugamubaz.pdfIn PDF document text
    • https://atavio.ru/files/file/lanupejapinavogobitupupef.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/nanizezonolazir.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/34315086238.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/gides.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/mozimevikameravur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=carrom+pool+unlimited+money+apk+downloadPDF 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_off0000ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 15420 bytes
SHA-256: 2a28c2201ceb717e0a1417dd2bc77cfc0e8ef1e8e5981c8cabfb2b140a1f7528
font_01_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10808 bytes
SHA-256: 7f8ae65395cf28f1ce65c02fac2687c8d68a3ea75fd89a0c7f494315b9e112c5

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