Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2539c6bf3e2bff…

MALICIOUS

PDF

116.7 KB Created: 2021-08-08 17:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8db911793b7a0b287b53a5102748c213 SHA-1: 36fe44fb031ddee098fb6b8b074ab06b172e01cc SHA-256: 0a2539c6bf3e2bff0e85d249f5f222db9f5ee99801f6b880d823732d3e1a5363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c057c1fe7436d77ad38b32e166d18a07/47029586702.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vhle08nl7l4a6n2lutsapq2tj9/jigasipijaxaretobox.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/41284431847.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/nemomitesu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788db38087---9254675918.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/40597697069.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/resifaxug.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/xudoderibuku.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/geregoluvufononun.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/77168849991.pdfIn PDF document text
    • http://gdgom.com/upload/file/210625071841952387cicgp4ekl935.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/golejelajumexixamig.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/bilesunarejugolojowimovok.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bfb32f09---34770716998.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/punepurinuji.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/82742655598.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6e9218p46i7016dlamnvq99468/33280513501.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072637b37145---60596263138.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/82eq0a98b989iq26fst3skg5ca/69632124253.pdfIn PDF document text
    • https://thepainter.asia/upload/files/42836353160.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/38714977581.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b7c3c117---sekobivomakivamugajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+a+herniated+disc+in+your+backPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/xebunelikaf.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_off0001651b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2D 18200 bytes
SHA-256: 6650837a90621129388b4aa03c2a1cea444fb690f0999947e5c461868d44f91c
font_02_sfnt_off0001ac30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC30 10860 bytes
SHA-256: aa26676974d020f1e9f0042c4cc99b19d4b2a3373dbd16e96209ab5c30a569d3

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