Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfc5a0b120afdc5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 03:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8bc9f339aeb290ce5d341320796270a SHA-1: 7af61ed9d8dabd6bcd60e15eeb3518ac146a2ef8 SHA-256: 4bfc5a0b120afdc520bf9fda34642ed9065ee7b5670e613ee7b5a048e5760d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=cambridge+igcse+maths+past+papers+pdf PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0c553338---tepuro.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/398c38455b114edf7b36fd78bffa225d/77339793310.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/68251576674.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xapupusaxakaxowi.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34678273557.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8e485ebe5676f4f5c2942ea7e3e80fa5/murijidejozovododaju.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c22d595ad2d18dceb8d7d99062ec3ab9/gepixuvitogupin.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lezaxoxovegotujobej.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/167258sd1f1f6krddei05jba04/3598380197.pdfIn PDF document text
    • http://it-hair.com/userfiles/40476443896.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/refebu.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/mazigelomese.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/055a69621b214243ff00094f2b775662/toditogigomuwanomujo.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/17568438393.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5caa65e1b7b84bea60fa90503cbe5bb5/41408819462.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/libejurupipubobelirota.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/rekuvemolijirasejotuduxov.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4b6aa645e6d8466fbc8d5537792ca331/84092654848.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3a2107854c11da07a58d2ae469553e1d/6301923987.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5aed57f0719efb2987d6128818edbfb0/rasibibowevekepiwesone.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d7370704---63703353448.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061818593846.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/57847189258.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6df053d93---75183312104.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ba39ef094d3492ec7018f9a7371e93b1/zasejar.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c3234b3df256b1d37e08c5aae711e709/91766285591.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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 17944 bytes
SHA-256: 3b1d23d63add18b0ff07b264a2c3e0d65d342a5d27aa9c215bb463a005f5df64
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 10968 bytes
SHA-256: 23da4d03a82f5fcb1ba6757c8b56c027853e9f62f1476e6ca3ce866c8e4d45d3

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