Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fe02ed247c0c17…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 08:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17413d09c2c8d757770e786dab1ce8fb SHA-1: 1354c7b0d9cbb9ae84201743c2cf4000c31b356a SHA-256: b5fe02ed247c0c17e51acb68067cf2fcc427ba52a57200d585a01cedc4e9e059
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 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://allytemp.ru/uplcv?utm_term=al+anon+books+pdf PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c8777fea---8494466217.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a63e8a4cd---79431673757.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f1b4a9ef---rutofuzidebizejomor.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mvkkd4j1m91qcstivkrn55oart/nizutipixodobazexof.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/tomixok.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/tiruvapazodaketelekuku.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/2n75aucbm2nn6a7drhjsk6ej34/buwusizawufetijo.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/85715748225.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/35941224421.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd40346baac---29389192455.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/8260653251.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/78154911453.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xidij.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/33448744433.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e27cd8b37c4a4cb6d4d2954ea425e64e/36137370812.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b68a194220a---26025511408.pdfIn PDF document text
    • https://avenue102.com/uploads/file/waxavizakexi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/vexolewagexex.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad3c5b039---gedepepojinevasulub.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/mmkt969himjujulgjutf0hcgq5/91464827509.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/zarasutuja.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/zolejujuvose.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_off0000b9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 10280 bytes
SHA-256: 18f98f4e893bc526604a34246aaa411ea3e5f65f0cd7441a8ce821b915d42499
font_02_sfnt_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 15932 bytes
SHA-256: 41eb144c0267c43b68335307b2f83a6f9751a345f736c2718335461c8cf60943

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