Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ca156c4e14f0cc…

MALICIOUS

PDF

83.2 KB Created: 2021-08-09 06:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4997842bfc3ad55d55b651531d49a719 SHA-1: 7e30e1fff892b3eee05cbcad5a129d6bb82ee71c SHA-256: d5ca156c4e14f0ccd0fba0e0a0206b9cd3103d9728df62e482519b82e5198df1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and link farm behavior align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://apexhealthnutrition.com/newerac2c/userfiles/file/dilagikadobonedaxobub.pdf In PDF document text
    • https://hospvetcentral.pt/site/upload/file/3057046482.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0d2ac217---dolasupu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eaef998bc---moxuwowawezutadexale.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/miromareko.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfa379c24---mixagozaniduguliman.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/81666276343.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/41000500081.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/29302749046.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/22311201509.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pijito.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/xepekufik.pdfIn PDF document text
    • http://amandamaitland.com/images/file/66155358963.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/37533983637.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8e852764---93222954250.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/77059124688.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/q53jere15e73veo5qrcg1kgsjl/fifimurifevum.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/goxuwidadatefifofowotolar.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/30pjhdmsqha6rrfhv5dd9tth64/30381185852.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wizogutasuvafadifeligido.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/qkscgh9tc9gnnia8dboemseccf/letinilitubiwuzowureton.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/botekeletafitodod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=arihant+objective+chemistry+for+neet+vol+1+pdf+free+downloadPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 11456 bytes
SHA-256: 462adc04eb0f04d50eb66ad19ce0c45669e6952051b08ddadbc74252d4776019
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 17264 bytes
SHA-256: c70b42ddd61ba791b935de2a5d9824847f3f1a9b2f70dc1fa83456b855781e83
font_02_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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