Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec204b8fff71e33…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0206911ad58455f20044e6b74357c067 SHA-1: d8ea84d3db925c80352b0db787e0461ea24f4156 SHA-256: 7ec204b8fff71e3356e11da1cc9dfd9e8ca416d2cb941ffa5a1e68ce2984acfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, indicated by numerous external URIs and link farms pointing to potentially compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://catamma.ru/uplcv?utm_term=geology+notes+pdf+download PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608418563b395---xifumudujaridifusapas.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/18263841915.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/8cc3c40e0f0184fd382e2181cbe80508/4070171577.pdfIn PDF document text
    • https://aedwea.com/upload/foto/33389399996.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3653a439bb4596c9513f710c49e9658b/44734975590.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7617dd9c---62117276398.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05ad30abb---vagijufoz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877654eb014---xidomolofarig.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/nojigelore.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607065878d9a7---mejilejomuzigomi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcba28a90ba---55839427533.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/xasit.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/lurijujixujexekitize.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pimer.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zabezatitunojudaruwuwixu.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozajutisapod.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbd8e598e---29903648677.pdfIn PDF document text
    • http://schokozentrale.de/idata/ruverujo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1cfd493ab127cd6746eda849ed3a55b3/wumawig.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/guxinuliwelalotet.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/kazazusedalugikovidira.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_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 10720 bytes
SHA-256: 69c9511d1e26a1d9178a15620bec0c3608bbbb3173f80dad772ee18733b90881
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 17628 bytes
SHA-256: d04c78110a1920e5232d8ae8c52124fea563c92b110e6c464d6df707f56c3b9b

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