Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec62f870784bab0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 06:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f430486933c36b4cfba890cfe8910e5 SHA-1: 9f3cf9bcbe5065314a88d3e816a4df9a241b252c SHA-256: aec62f870784bab02c028d61760db750b6579401e9529501681f56baef41f289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate the download or execution of a secondary payload. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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://chcial.ru/uplcv?utm_term=puppeteer+pdf+full+page PDF link annotation
    • http://ccsilver.kr/files/fckeditor/file/946941510611fb31d95bee.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/peximuret.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nejovikoresuraroros.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210731215559.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751447a6052---jegonijexobukajazufoda.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/60534443611.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dac588cb60d9bf59d2f0f541dbd6547c/timopatu.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/61070622888.pdfIn PDF document text
    • http://www.heksan.com.pl/file/23618138771.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/wagalij.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/28039544435.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/timojogobovoxedelefadu.pdfIn PDF document text
    • https://stvorki.ru/files/file/92267942736.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gmfiv7o1c8gokollq1jneoq6nu/80365484250.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f191a929dc7---roposi.pdfIn PDF document text
    • http://bienbao.net/uploads/files/pawedinibawukigovatuk.pdfIn PDF document text
    • http://findacommodity.com/upload/file/955408688.pdfIn PDF document text
    • http://lawngo.net/fckfiles/25840021138.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/793e2a8bc0631813100ce90bfbe27f0e/68942416637.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/18091035266.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210626080135.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/52026145036.pdfIn PDF document text
    • http://cssh.es/img/file/kobowidap.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/2459110379.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a586ecca39647251642036a4594a19b4/bitoduzapiv.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/50083582706.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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10288 bytes
SHA-256: ce701bcca27239c8c2018c6abc5d03687be2c8623c2aff4a43c08160f5905096
font_02_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 17960 bytes
SHA-256: 0d2ac2f531554edd6d82a91eaa1af74e9d60ee8e09e469cf519d268face02525

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