Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2af60ce1e63313…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 09:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f496a0c03718d482cac5e6c7a906310d SHA-1: 986c6c873d3d92d41a5a15e3e54cd5dddfaf662b SHA-256: ca2af60ce1e6331394fa58f6334327337018986d74bad9d56a974e9d5eb9703d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of external URIs and link farm characteristics suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bbfederico2.net/userfiles/file/97091193080.pdf In PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/5550967464.pdfIn PDF document text
    • http://parilka.by/var/upload/file/vijoxolo.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/22874429335.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/78972366592.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/55728523026.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/68460806939.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nolexerezi.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gagodawirigolujemi.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/josujelewagisepik.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/75113220493.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/dexexemepowufofuzupema.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/jujuxupovononibunekera.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0f79892a---jadexunukizuwojogo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138363407488---73288155418.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/57728626592.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c408206a22---3700435057.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/motetuto.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tatidatisosegifi.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/49489819197.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jisonixaxuke.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613255f0c1c8a---riwaxuzotofo.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/kapeliw.pdfIn PDF document text
    • https://unaizahic.com/Files/files/dijozufate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=amazon+prime+mod+apk+free+subscriptionPDF 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_off0000b5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E3 15264 bytes
SHA-256: 91d76337eb496436b35e1c9510c79e97e3e566183921d181cffab1ce14d3df10
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 11108 bytes
SHA-256: 5923dff1d9d40a509220e9f0a649b14a9a49c0f8d1ef75cbd2667a16ee8775dd
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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