Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b7b51c127e515d…

MALICIOUS

PDF

82.9 KB Created: 2021-08-19 06:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f2f47636c4d9ac3b83cdeedc313cf0d SHA-1: 57f537bd6d8993db529e125d7c17584a196dba1e SHA-256: 16b7b51c127e515d54d30444a5f1f64537138ae15dced681fc7cfa46a03cb168
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://resulgame.com/calisma2/files/uploads/pegasinarif.pdf In PDF document text
    • http://bowlingkillers.com/imgdb/files/4093277451.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af63e72c55---98554664117.pdfIn PDF document text
    • https://airbays.com/userfiles/file/ramugisugaxotesawaj.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/11288006501.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/67477775264.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/pejogamosuxe.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/makojabamapesamot.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/35132066533.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/28307202066.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vuvuzadifazexivelidubijuj.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/6375971244.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41318774777.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c911719ea0a41aa4420c3dd317c93875/68459628366.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3igpqqo7pkhd5ibrh5v637jk92/wixulezerisoxija.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fe9193c4---gibuboxatada.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624350158.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/daxofimebotazetosu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c46738829---47177286547.pdfIn PDF document text
    • https://brod-plovdiv.com/images/91680960667.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pu3sv4c02bmhm06n0ph33lh1j1/natozewujilifit.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/vabubelusekovugal.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wajulolusa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8fb9541c---29928056521.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/sopuguxofaretiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+bride+and+prejudice+online+free+megavideoPDF 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_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 17812 bytes
SHA-256: 9b80468e4095955549b333054aa69c7392a04d4239b4eeec1a3886d198bb4df4
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 11328 bytes
SHA-256: bfed44d782a4d9466df2b43149839d5739157a3a5f0b4a3a5b7e73af0bb3134b
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1