Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf8b63d10e3d22f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 04:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f80415d63227ba3164f43d4780570823 SHA-1: 2859b12205e3efa19b2b39304421aff09c77aeed SHA-256: 4cf8b63d10e3d22f7ede097a738f61e70d8addc1c90d2c3b09085f058f9e92d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=liquid+soap+making+procedure+pdf PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/01b74b42f36d0969353cdef31f4be37a/lepedegeda.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6165321b3---9535358413.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/54113288162.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/6487f99d466447a087823e8b1e0746d5/48576933699.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/379d89de8dd8ce5b02971ba331ac4224/jesufozopikutamabagubax.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/99862153410.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fed80066316---67326558777.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4c77896a---zavixedelovosusufegijaz.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6b17880e795d4de0b84eaef27f128e84/minamikara.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fejikidomokilevefetozivi.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/wofalan.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55806120851.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/lirote.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7lj4ahvlq3q1d4n4loimm8jm8/defabesumitedi.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/gonodeduxaru.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/47236576727.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/kopopabosizuvozibibimo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/kinesofup.pdfIn PDF document text
    • https://europartner2.pl/uploads/26933225212.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/nagivi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e36402a48---vazojuvuzolagosuvavivis.pdfIn PDF document text
    • http://erictex.com/ufiles/files/pepalapatesozusibako.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_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 17228 bytes
SHA-256: 2077549f18b89d0e060d462f0de79decd0758e5e3b58a61361a8cf7b02f32c4d
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 11112 bytes
SHA-256: 4ce95eacb14df3b66e404b55cc0913fcc5b2799ec2b09468cb2afaaac8ff27ef

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