Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa91f30ec65bf84…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 08:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9352c27fe125ed9e91a20b7b079af6e8 SHA-1: 1e978c793162d9a1f63272aefaf5facd82d47dc0 SHA-256: 9aa91f30ec65bf84d52013786dc6513c4a55c3e14651f2dbcc8317f14b628386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://huntic.ru/uplcv?utm_term=discord+download+tablet PDF link annotation
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiludomikinukosa.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/venukazavizagadukuvuka.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/13266895889.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41136dd0b---70919253901.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141b03790f02---tisowuvota.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/megifopamejaniwopuno.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/96068530289.pdfIn PDF document text
    • http://beta-rc.com/upload/files/rowirevotosejo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/sesefidixozoti.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/96023686276.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/62942270288.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/kunew.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/8927327842.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/badubomefugoxadadidor.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/41354257592.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/fosuzoxit.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/oefosn3gajiipjop9l0poncq30/76273913677.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142281bac362---24682458656.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e24727b6ab13bb87ab8b472a054d1b1/49896858669.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/27273514572.pdfIn PDF document text
    • http://hueide.com/upload/files/39218904754.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/nabajefuj.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210924_EAF1AE9439C1F52F.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/59782485439.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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 10592 bytes
SHA-256: 9290b69382614b1fce22337a1ae79317db5e72e4e5393c2a4302c2a6f7f9f388
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 17076 bytes
SHA-256: 0398d06f2b3a5362946f83f87e2e5cde7f68d0245c73b0167fd4c0da66775d04