Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddbaa40bbfdf0c7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 07:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df5378a54026db29fa0ee078b1696483 SHA-1: c07e05ae335a6721cfa99f111e9ef9c3db505c03 SHA-256: 2ddbaa40bbfdf0c749424a4e316d7e6f4041815b2c91cb48ad80457fb1a92f32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, as indicated by multiple heuristics and extracted URLs pointing to various domains. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests a malicious intent to redirect users. Although no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection, hence the inclusion of T1059.007. The primary attack vector is likely spearphishing, as indicated by T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hebammenglueck.de/ckfinder/userfiles/files/wikufawu.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/ratekerolumovelon.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/samebirarinakidoma.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609467de458b1---90343316961.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/wavenekebiwuvemaduzide.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073864d51e43---xifewonesepiselune.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/vebimumoturatowulofe.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nepeviwewovanidas.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607555ed515cd---xotamopitobidel.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210721070257.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/betesizurugufa.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/vukerarasunitogikas.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ff0ba1c2---71885147312.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/rowusakalap.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/3971495831.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081894673aed---dotajokojufolaw.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/g735g0mdocosp5f3sk8mi1ha87/37134019513.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b338ae92e60---13442354974.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/kimol.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nitikefulititer.pdfIn PDF document text
    • http://npas.ru/pic/file/57573457852.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3bf9mvd84vvratfth6mtmvtln3/27527362031.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/99536484210.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/60087301073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=anker+nebula+mars+2+manualPDF 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_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 18200 bytes
SHA-256: d62649ac209c1f35ba1ecff4ae5782a17ce30f77f7d97db5ac07f0f50a875716
font_01_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 10392 bytes
SHA-256: 1e200539dd4d5951c93b6f148816def9052527507a6c484d16d805d9165e7744

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