Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e38e61cfe52727c…

MALICIOUS

PDF

87.6 KB Created: 2021-08-04 07:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fb80178ffdb08c29948ca084b07302b SHA-1: 6895fbafd11ca9ae574772de0b2d17fa5b1c7995 SHA-256: 4e38e61cfe52727cdf8fce57d1fb84851d39defd5c7e4b45531cbad8b369925c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to direct users to malicious content. The embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://wenxuezj.com/images/File/timovutadukoge.pdf In PDF document text
    • http://hyundai-dongdo.vn/images/files/rogurivalag.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/863e2a3686e257f9e28786ab8ea54696/67847369243.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/gopekugaxexuzexe.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/37542072337.pdfIn PDF document text
    • http://plncse.hu/php_data/file/34844853460.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ff93514f0---9633579215.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/63335430064.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/37313049409.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107172158011834.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210625105356.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/54714258864.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cb485b6647306b20430464d1d488169f/23078585132.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/738555138.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/963515f35cee2b268a7784f834fa72b3/tumojigomumevodogosuku.pdfIn PDF document text
    • http://ha-sine.com/d/files/mizaverepibaduwur.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/tenagodiwe.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/labesupusekaj.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3e47101a77442a15c7e98588e8527fd1/35821718895.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d04aa50fc---85318252720.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/187e48fcd29f86c5ac6643dbb6b9769b/gipewovifelotonig.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160713e350a36b---24839814066.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/69901595272.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcd49b754c---30921299940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=super+mecha+champions+hack+apkPDF 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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 18356 bytes
SHA-256: 2065aa2365a1330cacc8d493cf1666f9aa49b5cb37685a38431e2c1094ec6e91
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 10764 bytes
SHA-256: c68d110ebcf00d2b32c9d37ef1d0dd7209a9813110d2c2c2f16e2596bc097f41

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