Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef23488ad1345db0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 18:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 890f6e85b415e211000f9948653f193e SHA-1: 4c0cb944a68372e3beeaf2c3f01c752bdac5e809 SHA-256: ef23488ad1345db09212a23eb7c11fac0481bb76f5d7ad9c7fb2f5dac24f8b59
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/derugodovofijaza.pdf In PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/genabet.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/57951100267.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/30715074044.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/nedivavixoxirogekitof.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/48247911330.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161345b5d41f78---renifalegop.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pcnkmihtko6l52d4on5hhjqijq/vadox.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9011279fb---49768831920.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/bobisakuxikinari.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zamodekivisi.pdfPDF link annotation
    • http://studiotecnicolari.it/userfiles/files/nadonajemulakuvojo.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/mapavitobi.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/bigewanusugig.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/puwujebomebetudokekiruwop.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/gojevosuletirigelekegur.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/64678778900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+11+processorPDF 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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 19316 bytes
SHA-256: ea5f0203830a7829191df1266e4fbdeb392e610250eabd1fe62e35846facd141
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10232 bytes
SHA-256: de079e9c8bfbd3b365244ec09145c31008ad90188c9aad67ef0e8e6fb51b0763
font_02_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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