Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a783ea1121744ef…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 23:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e55eaad2926f0e400d154c587f2ecc1 SHA-1: 4eaababfd3e7d06145dce31d2bc92766f9fc1f45 SHA-256: 1a783ea1121744ef4ca5bb873755f893e9e2470a9302993d726e06bad02e7410
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://olympicburger1988.com/uploads/files/wumukako.pdf In PDF document text
    • https://bunian-co.com/other_files/File/75305763859.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/87919612144.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/togisinizaporuwoxofaj.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/m5g4smbv6aaaoe8ktptv3ut8qk/bipejedagipexe.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/35873801153.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/3708788522.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bisowenurikubabetabixorur.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/82737543950.pdfIn PDF document text
    • https://begili.com/uploads/image/files/dibedufiv.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109091424181673.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/loxosewanon.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143a993ee680---14394924102.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/57710682942.pdfIn PDF document text
    • http://fpole.ru/sadm_files/vosotiwidilisabi.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/21602283217.pdfIn PDF document text
    • http://carszana.com/image/upload/File/56885445244.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/nudetezag.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133569e9525b---64749249806.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/debofoduxovidovozijiveser.pdfIn PDF document text
    • http://notarius.jurist-info.ru/uploads/news/fckeditor/file/88409573961.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021921398565.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/84735732803.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/72858606039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=instagram+private+profile+viewer+urlPDF 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_off0000b00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00B 10904 bytes
SHA-256: 3664e7a94cf93332a0024772a68d0d9bf11ce0b9e30602ee5329baf929144a79
font_01_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 16496 bytes
SHA-256: 560d5d3a897c4930f619676995660eaca8494a5550f7369859410e7e16f01407

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