Malicious PDF — malware analysis report

Static analysis result for SHA-256 1248acfaa026b0e9…

MALICIOUS

PDF

93.4 KB Created: 2021-09-01 06:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7f996b6ed44483de296857dc9d29f5a SHA-1: 5e37094d308de8fe1057960266f25890eec25f00 SHA-256: 1248acfaa026b0e9003a65199208e337d756aba3a5c024865ded6878cddedd35
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://topjobsnepal.com/ckfinder/userfiles/files/josopuresojigexar.pdf In PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88939919558.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/1165375442.pdfIn PDF document text
    • http://valeneighbors.com/userimages/sawabiwizitimi.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cebus664qak3ugvo4scrgtm8i/46007171163.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/bekib.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xamulufubivos.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/jegido.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbc5ba08f---sidejovilikalove.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pefoke.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/bujepum.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/fokurekurepamidozofele.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/wironak.pdfIn PDF document text
    • http://pvvc.cz/files/gobipilemusuwoluganivor.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce50b359e8---42388187780.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fbb812d32dc2b3d6ed6d8030843d9d94/dojudikimikuzavozi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17eb4fe5b---tuzusofizuvisakuzawifub.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/d1snd8gvpceg0f679d63adobf7/viputex.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/22282159988.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/21985710998.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094886c328cb---47532918026.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/32509467712.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/suxexizezozomotil.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/tademe.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/tukada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=people+having+worse+day+than+youPDF 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_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 11040 bytes
SHA-256: 33afaa971c2bc139269f5a1339d8149130792724778e6ee4c7e7c5bfe746631e
font_01_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 17376 bytes
SHA-256: c85e19b73ec34d452fadafdad3718ceac05e9c14e6fa920df6dd8094e329629c
font_02_sfnt_off00014f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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