Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7987307c9b9e896…

MALICIOUS

PDF

76.1 KB Created: 2021-07-29 19:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e845daba6ad5002145a31501494fc18 SHA-1: 3825735c69aebcfa4134de4d4029d5cdffa10f1c SHA-256: e7987307c9b9e896965b0bca98f8874181769b71f241d5049781a0d3e7908dbb
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports this. No scripts were extracted, but the overall structure suggests a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://brianhigbielaw.com/UserFiles/file/61472132907.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/xajuduramirapapilelik.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b806d0abf8700bff9abce93b3d97feab/14051522276.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/japikijubavunenonupigut.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56067632bc---pilenezugomofi.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/44862672101.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/oqfv9lk57rrq86bsmf3aitjroj/pabevowosojar.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/dojasot.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ce6ae288---10314683179.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1d8635ce---74025329939.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b485c1b6180---moredanane.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f3b5a60be---kaluzakatatotonutadud.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/34096359065.pdfIn PDF document text
    • http://dgjst.com/upfile/file/gizefima.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/tutezezibexofogib.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d22f728de---xulifaredukenifove.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070907205773499.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/9f64006e33de3cad5ed4e08abd1cb750/fujubovokapemutiragov.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/564b5c280529c03c05b415b7a8bbbbeb/falabagegovitosojoki.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/32f57c19040071b3da175b6b50c108e6/92102713616.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zugazifeganidisevumojekis.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/62712859790.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/2694799501.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/44840300601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=har+taraf+har+jagah+song+download+mr+jattPDF 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_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 10784 bytes
SHA-256: ffac175e3a9febaa777abca37bd70b05b45b0259871d5a9f1c158f749167a08e
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16368 bytes
SHA-256: 841273d1214241f15cc787e8fe83a16a71f8a86098b027465e07e74de065a842

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