Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0783865927cacd…

MALICIOUS

PDF

85.5 KB Created: 2021-07-25 07:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4c9c1248d8fdcb8bc35b30c07d35713 SHA-1: 7df1b23c962f6c86c4e60c7a5c9f3582308db386 SHA-256: bc0783865927cacdf6edae63604414442a977a6eff12c8f73c4c05fb980b883c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://villalapinetafavignana.it/userfiles/files/23005822153.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ilmetkpclemo02i9soq8k34rs2/24243157543.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/33987350852.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/18291301706.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jakigub.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bc3902e8---78215916527.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xowifefewelugenopire.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/5027425110.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/17678061028.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/91645033751.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/589416985.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070eaf8e20df---54389726233.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/jibivozajepupidedexomafam.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/67114354003.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2a5bcef0---tusotajuguxubo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/42589090445.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/xatevakowo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c892f83c1e7c7922fad4cf2a90e63f65/wiseriwanivezuram.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/49234947611.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0138ac6dd7dda1883f5ba540e05c2a98/65625245939.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2ca8e74d150a3334e8ccb1df65b7696c/59059099766.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/29752407141.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/aq1iobovfaotf6m5nooultnqc2/xokoxebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+descriptive+survey+questionnairePDF 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_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16984 bytes
SHA-256: 5721c54e8b276cfc21af2dbe0960457625f0a157a03889922f9972db673693d6
font_01_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 10984 bytes
SHA-256: 42b2f5a0f440a2b882b23218902edc46e724f7aad9f7bd9a6baa37645a457255
font_02_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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