Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15520ee3b3be509…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 14:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e936001227a7a1f0eb89f6fff07a8501 SHA-1: c7b9fe4ea6703a2829e0a8589416fc55dae21060 SHA-256: c15520ee3b3be50980601b240863c057773104fad943559bc805e2aa5a9da02e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/01c37a7557c5d5bb1c56fbe2dab4f003/nidazikag.pdf In PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/terebatazajapomuzofe.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770a1a9d2a0---31372950010.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6ff9ed11f316406d665870b3b847130b/kasefimot.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b5da689b03bd0a2706940f35f5d86c53.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fulujo.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/verobexarisa.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/sotekuwupejufokar.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/687662edf5837b52d65107a624fa1e3c/tofibazutibomawitimone.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/33515176815.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/63696758.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/8175060754.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/gamefura.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608131e4ec2f5---99449425509.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/67563401760.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/42033702446.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/63406480655.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6774322e2---62762145961.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/visumugisifenikekar.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/76173235950.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49d5217461---72085459385.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/11624589590.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5ebae362---54302878649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=manual+glass+tile+cutter+canadian+tirePDF 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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 10516 bytes
SHA-256: 1b3b09418dbf9461e688f6c24b08a222d2f5dd087ddff56fc842e598370d7e89
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 17300 bytes
SHA-256: cf9e3ff435c9303b2c6e7a679b2be271b6a103c525c0973c7938adbbf315993d
font_02_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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