Malicious PDF — malware analysis report

Static analysis result for SHA-256 82940f8a3da59142…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 04:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94f7bb9a603a48b8f168b91835c0dfd5 SHA-1: 8a2720a5456f881496ffc235ff326049df43c5fd SHA-256: 82940f8a3da59142803c68f983d435b376723daf8f608651ee1509726b4e0417
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains embedded JavaScript and presents itself as an image-only lure, typical of phishing campaigns designed to trick users into clicking a link. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a coordinated effort to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=drag+racer+v2 PDF link annotation
    • http://refpecsbelvaros.hu/kepek/files/22922043397.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xunimuravefexi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ecec2fb2---94922306578.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210921072238012072wkdzxd.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/kiwikipedume.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6b9b0918---menudilaken.pdfIn PDF document text
    • https://ip-pharma.net/data/files/jirojubeperopitaledeno.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/tonedujige.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/80066711661.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1632441538.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614293973c17a---61507390837.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/43678315595.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/59822205724.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/sepiwaxedimu.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/44558330120.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/foxafes.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/batakibibupasesepufi.pdfIn PDF document text
    • https://12shio3.com/contents/files/lujijuromipekafete.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8f6132585c95390089ddaef05107961e/titor.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/piwazoxidezibe.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/xusufodi.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/xujatadoxazel.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/jogos.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161455e8cebbce---82477970222.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_off0000affc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 9964 bytes
SHA-256: 62f36895053dc0b5aa25092ef5ebdc0da198ad3863c6c3564dad41853062e04e
font_01_sfnt_off0000c63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 13972 bytes
SHA-256: 0ef45f7dd621e40a8ccaae2d135a39984014b87d289461412401c33c382adb78

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