Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd88aae3cdc8020…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 20:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46d8e5b8e6fa4ed1b2ba25bb8fc0af97 SHA-1: de89b3e29f4dca3f36e0b4be65ea970ae8dbe9de SHA-256: 7fd88aae3cdc8020f2aa2d36db4c8b348f2f895332f8d938682d0cec016c2312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=the+king+of+fighters+98+descargar+para+android+gratis PDF link annotation
    • http://stellarp.com/userfiles/files/kokibirodonixitugemigugor.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c973fc8eff937816605954708c2b979c/87395952976.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/94747202035.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/dixafino.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/514023923.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6924427642.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/28900811513.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/71f865596c6b42b9fc0f8b8899368338/83820671380.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/8886929898.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/63901536112.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f472cec3b7---jexirosivexodirag.pdfIn PDF document text
    • https://ratodua.com/contents/files/19997733129.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8650dbf5---moribowekegexaluzawo.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/mukuje.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/sirowubir.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8q71eb6a0r88jsbqc2gjdf8iq4/kaloguralinojupijaj.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/96138760177.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/lewaruj.pdfIn PDF document text
    • http://bociany.sk/media/file/25683151790.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/worunoxefef.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a32aa5497de77375b49a20cd8a78d1e9/gezuwakadegatarozij.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/56994992326.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/mebetajugukebilifefigum.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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 11284 bytes
SHA-256: c6f98817fb0e77754a6c4fa537a2ecc521797eee3a77d0d18e65a956da18fe29
font_02_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 22360 bytes
SHA-256: 27436bd0e4c6c8ed99c2e6525ec02dde2101d2cbec736a7aa4799cfdaae7752d

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