Malicious PDF — malware analysis report

Static analysis result for SHA-256 7198ab4fdcc264a0…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 13:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eecb6466495013abb925a9ab03b9820b SHA-1: 8949b5d86764db821a5fd415e48391b4284f50cc SHA-256: 7198ab4fdcc264a07db34cfa0c6e0a1721e058d09a7e6a26bd3f324cbda831f4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further supporting its use as a deceptive interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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 68 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://oniceh.ru/uplcv?utm_term=tubemate+3.0+free+download+for+android PDF link annotation
    • http://avandcie-automation.fr/ckfinder/userfiles/files/dozodenal.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f01bdd3dd---18451500111.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70b9b1f9f---sipifiwi.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/22763974239.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cbd6457f3e9b092717789640817a323c/suwobagu.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/99443946154.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/pabopurategapupofosa.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/teburarutezajag.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/lisovokegirok.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/poworewomapudebuwusuwowi.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/97516344003.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109011514061635.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/jajuzebasunizotosut.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/55972647835.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/7103671849.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109031558122702.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/56209748536.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/zanumefebunuvugukuri.pdfIn PDF document text
    • http://net-marketing.hu/images/files/95883963936.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/48459345155.pdfIn PDF document text
    • http://rvhifi.cz/files/file/99542528104.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_off0000b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 14104 bytes
SHA-256: edc6712bcc84893f2d096baea281f6e0ad55e2a185029d3fa85c53511400c561
font_02_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10996 bytes
SHA-256: 77ef95a50394aa54eaf6a78dbe7ff22d32ccfb37adfe1fd7c533783683f2dc29

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