Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1260967dca40d65…

MALICIOUS

PDF

97.3 KB Created: 2021-09-02 03:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a92a991f9c6b2db212be1b5656a54c81 SHA-1: 3ed7cd0d373336c9f6c28e8ed10dccb1b5f1f252 SHA-256: a1260967dca40d65a25b48008ad438e6254fd7cc03ef6e111870022b4642e1b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=manufacturing+account+problems+and+solutions+pdf PDF link annotation
    • http://zrdb-drogbud.pl/Upload/file/defufejo.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/warorotevutazikixijavovi.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xotikepeke.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/29131879944.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/594fe8edef88efb6973b9c91f15c4b5a/zixubosixewimogigog.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/lebajifapoj.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee31f4c4c8---rabakonusizubu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kapita.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/090vcbeh0morcli1si7p2bctn2/vusaf.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/moduniwuxinutudatufeda.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/49082514445.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/12f0b5c0ddb40ef39ac12091bf44f21c/81226320624.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/19770973257.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/90634161403.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d9842b3747---talofejovewadebam.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/87486634257.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/95474037983.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fozelotiduxe.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/35190973361.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zadisifalol.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/pevalese.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/julilegogoridekekovuzupel.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_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 11196 bytes
SHA-256: ef71c37734ea1e4c1edba999d47622e9f8f75a5224cf0a47c942dac024b8b919
font_01_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001485d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485D 17756 bytes
SHA-256: 895787981a949a0306f7e2a1bfa5d1842bb37f1b249615350351d682bac9b35d

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