Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9fa7a15c17802e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 07:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88d6fa6ad1c63613b6d0bee0d8afa2b3 SHA-1: ba1679c9903662ec57a5b7c5a56d7e62dc4fc1a2 SHA-256: 8c9fa7a15c17802eba788b970e0666688c1d3bd532ff477116cd2ed1358db4c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

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 https://irlanc.ru/uplcv?utm_term=ai+and+the+antichrist PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4fbac6b1---76269472020.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/mazugotebexegijuzozo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078865f08381---gobizu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c95fd92e1---12115894849.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210901052746_937218830.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840830af256---33906231869.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/65634586378.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/34964498060.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/de8264b4fcd22b1adc08840457f49d1f/82132007484.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/17308072787.pdfIn PDF document text
    • https://unosms.us/userfiles/file/10324728416.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/dazezanileropop.pdfIn PDF document text
    • http://indecomavo.pl/inc/gotorabupimivufifomezolu.pdfIn PDF document text
    • http://adamant54.ru/userfiles/files/75106584794.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7afe2964763829b2b92607e115877102/mimuzojapepujexeliweg.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/86579222182.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/31345376469.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/84591744518.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/57894141625.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/bcff07dfc7181fa32d4132dd71d15d06/direvoj.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/iet9p0ai8320gton00u25pnvl4/runomojiwoneti.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/57519117653.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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 10280 bytes
SHA-256: 9ed9a3dc884c0495168644573c81122a5a2e6c6c795b442752a9b7e06c1106dc
font_02_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 18044 bytes
SHA-256: 553010f52512c92d5d7b33e9080453c2b0c58008835d2c7bdec0488ae3b6a33c

Open this report in the interactive analyzer, or submit your own file for analysis.