Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b483f97a5d422…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 14:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80c9f38531dd065fd557d0dd4e035dce SHA-1: 27a4aa9cf5cedffb019c4927c09ca1162aa668ce SHA-256: 430b483f97a5d422a22ff15f61d5cd198a71d69980d6f8eba2710b6918e06944
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b058e2225a8---jasuredojozofi.pdf In PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/72571300859.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/rovuretobapolemag.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/4883279068.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/giferuguzigopofubaxa.pdfIn PDF document text
    • http://coffee33.ru/archive/file/35763010202.pdfIn PDF document text
    • https://patc.fr/imagesfile/56947071901.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41cfc2fe4d---xijuzo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3239e47cb06b35c49db6c27524918140/zobozagidafu.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/rekinomawivaloxar.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/78d1a7bdb5ad088243a7c27af7b697ab/66493807938.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161180449a4ac5---54938531596.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7b58b3a26c0551bbebd72c3a8a783e15/zezofofexoj.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/51055283721.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/aaqjks2hue4gjrdtpjct2qpqoc/pizuzimu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e402e1c74d54c4dfec145765e5b36071/mulaxafewezonabozomas.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/71626877476.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/54161081397.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/ledizodedowaritovul.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/56841008280.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/naxadizexajivifasa.pdfIn PDF document text
    • http://stonebreaker.at/nemuxodijire.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/rarifametosi.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zedinudulofinuvidapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=metodo+simbolico+o+verbalistico+pdfPDF 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_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 10876 bytes
SHA-256: eb64fa7dd017dcbbb978f5688aa05794e255aca5165438e7531198466317876f
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 18192 bytes
SHA-256: 5c1a6c0ee31dc22ca27b65e288ce40731c597012c6a27ec3cc8f284efe3865c3