Malicious PDF — malware analysis report

Static analysis result for SHA-256 8532ae16da0ed0a4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 12:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 370a006907babc26af62d934f6c56712 SHA-1: 7f3dd5a0a1a8290787e7a0f84db2d3d97af6939d SHA-256: 8532ae16da0ed0a40360360d2c56336d19fd9e7725fbd4028422a39527c96d84
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, hosting numerous URLs that point to other PDFs, many of which are hosted on compromised CMS upload directories. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=all+things+algebra+geometry+answer+key+pdf PDF link annotation
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lojanavakip.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d51319bb6d53798adbe79b1052b0bceb/92443170632.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/nuxepepiturukilokexe.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/logeleduvovo.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091316063857.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/bonerivejovamolap.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613890ba2c56e---30451903618.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8fd05ccd5ed4104b6571b949313ea4f0/1683357235.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mufimofixozakikasisi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4a484ebe---vujokifofolijivomilekij.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/wuselugirewosibuve.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/tasuninogisif.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/pawivobu.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/nedekenarumutareduzuxizu.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/povelonudifadaxurebowanos.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/70544403761.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/sujotewalonigajirupaxij.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/togikamuzelak.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/51842167615.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/41064445872.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfa8b4e92---peragozexafi.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/kifovefulovokugir.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_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 11360 bytes
SHA-256: 827de7239413cb155ee9dd6d4d9966b023b49acf8196722f3571942b65450c97
font_02_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 17588 bytes
SHA-256: f6824f3158c4b288fb9e654172a3fe1ecbf2461eee7282d3eb64c09056b4f9f3

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