Malicious PDF — malware analysis report

Static analysis result for SHA-256 9351571746179809…

MALICIOUS

PDF

89.8 KB Created: 2021-07-18 14:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 846a007407b16e0711306fc11af48fa6 SHA-1: 75c5efab627803945b00ad220a0d089c85a77063 SHA-256: 93515717461798090f811667d881af59a4fc1b2944eefe00afd60f55e47d47a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous links to compromised websites, likely serving as a link farm to host malicious files. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc7a42b8a---xedalafubuxadirigojeg.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/296ovahkcuif7ljc6mgt19vtp7/90583722791.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/memazagesasudebudo.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/xejijuguvebomiz.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/26373344186.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pu44rrbnsiigrtu1mfvqk08fs1/gimiwepigusekuje.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/poralafuzuvo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceec5ea4d6---68646180820.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/54567860796.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd020d523---titedekojipowe.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/29065438521.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701e093b51b---ranalivixipugubivawon.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a045e82ed---vinegefefasiwika.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/43174044738.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d5ebd381---70861068245.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa4a9a54b4c---71505794345.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/rusokaduferotetofedad.pdfIn PDF document text
    • http://fkhd.cz/data/img/56406851684.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086ebbc799---99514199125.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/17c31c49d4de4f48e088912a255052b1/xozibifoxiduvanumixubamo.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/62298168184.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/25777842601.pdfIn PDF document text
    • http://rykatd.com/files/saxakikudifafel.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/24159650288.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99597230977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kgf+chapter+1+full+movie+download+freePDF 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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 11196 bytes
SHA-256: 5616a36d621c41081fb7524b3d53f1313bb6b48339cb3538fae25d72c24719a6
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 17060 bytes
SHA-256: 8c8ea0979cd01ed2a8d9d98c68144b66323d6f2b54bec402167904962561ac34