Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e550214a55861c…

MALICIOUS

PDF

72.8 KB Created: 2021-10-03 13:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: baf996f3ba2ef1efebbd5191766b2f3f SHA-1: 2221b030f3c0f2a73afae6fd57a51b67f508aac6 SHA-256: f9e550214a55861c6a76e409d530283518df81efbeb2c78fb2258a9488c36b6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also includes numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=travis+scott+pick+up+the+phone+download+mp3 PDF link annotation
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/77944134022.pdfIn PDF document text
    • http://www.heksan.com.pl/file/53539597418.pdfIn PDF document text
    • http://hangzhou.chinatupai.com/web/js/ckfinder/userfiles/files/digofojuvufaribev.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/143c72d10395abc5db994591fb1673fb/kivov.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/xarewipekogudopopoxotawe.pdfIn PDF document text
    • http://home-plast.ru/foto/files/togifexemavibefikudikupas.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03aabd91c---94835519723.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/xewuzilokos.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/70001693366.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/29929212145.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/vifosejitetudopamuran.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/56255780053.pdfIn PDF document text
    • http://seo-methodes.com/userfiles/file/59334500885.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a57139bb7---votolemurovigixubudevobil.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/mudaduwufeguguvi.pdfIn PDF document text
    • https://tekmaker.com/upload/files/vifowu.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/71913697722.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109070202093691.pdfIn PDF document text
    • http://4yoga.by/pics/files/71139218104.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210904114443.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/99926308012.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/fipumajeseruwegolupolip.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/numudawi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16156fa3a042a0---29807246998.pdfIn PDF document text
    • 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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 18676 bytes
SHA-256: f13aa56949e4f4d4792148baec749f20e3f4bf9feebc15d5143026889ae2270a
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 11260 bytes
SHA-256: c7a937c498655b02764d4786031ef7ebd4e605e60676c710624115ad62cc63bf
font_02_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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