Malicious PDF — malware analysis report

Static analysis result for SHA-256 a237e65d191998fa…

MALICIOUS

PDF

67.5 KB Created: 2021-10-12 03:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ff4b7c40938cadf0578201aed34e262 SHA-1: eff1fd958b989448d704d146f65760dccfa6a3ee SHA-256: a237e65d191998fa3bf72bbf3ebaa790ef1b0a8ccdb57bd4442f978d88567b69
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be an image-based lure, typical for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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.
  • 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://motopujcovnateplice.cz/userfiles/file/14819881172.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6lnpuvdd07uar1jom81em2gkn2/tuwuluxa.pdfIn PDF document text
    • http://esistore.be/userfiles/file/busibigasupabisozi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qh8m7dlght34uaho2tto9s9p5q/bijenevirowunevibaguze.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/17900390901.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/pafewofarumuru.pdfIn PDF document text
    • http://precisao.net/files/files/55763504766.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27289882a---86050371795.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/xarobufavivadozamasega.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357d45998d2---84482017373.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/nutiwitaxe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614690e1cb862---50198105421.pdfIn PDF document text
    • https://mcorretajes.cl/upload/file/41863793633.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vonemabimukomixevi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a22caa37---19662356809.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/1606884938.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/26900762431.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/bijemigisuvaxe.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/tupejunezulawuloxitukiw.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/werelovorasom.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109260229508031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=many+and+variousPDF 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_off0000af42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 13920 bytes
SHA-256: c92b676273fb4ac90b43f47e5f71518e9df91decfa67cdd9619dbc56d69887f6
font_02_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 10236 bytes
SHA-256: e7040b433720c1b6c8febe9e2cce963c493c00b4cb4a02d179caad6e68171a1b

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