Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb18b5579853dc7d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 08:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 184ba1e09d1730ac1600667a9fc57c5f SHA-1: 011de680d1208ca6c2a0351c369a6bb93603aedb SHA-256: fb18b5579853dc7d539bb23efb59deca74b203f284b5d0b5d755971b24b074e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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 https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc9b96759---mikavajokafesafululif.pdf In PDF document text
    • http://skia22.ru/pic/file/kujukevo.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/98799901051.pdfIn PDF document text
    • https://blugarden.eu/file/49329948817.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/julojajusimavafowapam.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/8065067611.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/lakuvomanatovifu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c4f87c45---96503224038.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/22378084875.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/99251877403.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29260432407.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa9ca0b2f---zuwofifugirasepisotup.pdfIn PDF document text
    • http://obuchenie.bititechnika.com/img/file/gepajitekaseniranenadu.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/votut.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/45095912178.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/91506226485.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10b4288e2---gejitugi.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090423192473499.pdfIn PDF document text
    • http://spbi.cz/res/file/kigoweruvidefep.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/nemezibabavavakeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d98cdf6aa---zevonodigageral.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/fumataton.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-15/20210915230954465831.pdfIn PDF document text
    • http://principesgs.com/userfiles/file/wufalejorixobipoxevefix.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109041808158394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=plant+vs+zombie+2+mod+apk+free+shoppingPDF 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_off0000b62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62C 18464 bytes
SHA-256: 59840a62310a1d5fd645b838a0db393014676a36e6554c3906588af548564b59
font_01_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 11424 bytes
SHA-256: ca28b6bef99da507f7d3a6d269d650cc815e553142878f180fc14beeec220e12
font_02_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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