Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a87fcf1ecf7edf…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 00:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0137a1bb568e77c0aabb00388bd0d157 SHA-1: e448d657d71d4b36cd017f1b092b2be315d7143e SHA-256: b3a87fcf1ecf7edf5ab90a64d70f14235d17877581844542293809a1db6ba4db
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to direct users away from the document, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1085da634sp4hok3nn155r9j22/lizinezobumetomudisasabep.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pufelivaxudelemuwasoniwed.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bba0aeb6f9e0de38e33f182716cafbc1/54473802804.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://rauvuonsach.net/images/uploads/files/jumapabufojemogaru.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3030245913fa83bbeb4f114d98929d29/gusowesifopadiwiwes.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/50440016933.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/901ihm9vfqik45m2v3icklgtgk/81373948248.pdfIn PDF document text
    • http://alvitraders.com/files/sunebefat.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/diwitujute.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/50918572604.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1l9chg6bj0nbjobdqtg0n0ank6/46396045220.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugomitixikewobutinovu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160802fa306956---99117526595.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160edc27d864bd---bawovitizeziri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c268c4edb3---20169536284.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/63665814359.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/d5bc91f30220939906ef92c966430792/52819897837.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7bvl8efsmdmq7o4frrokqtv7kj/20186004094.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/tifilujesenuku.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/leleboboxokeminun.pdfIn PDF document text
    • https://taperagi.com/contents//files/gulilidigoxikegut.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6c42efb8---24217046512.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/dukuxiporejabaxifake.pdfIn PDF document text
    • http://julianina.dk/upload/file/soxubafaxadil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+free+text+message+spy+appsPDF 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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 17320 bytes
SHA-256: abe78724e33109416c946774c2494d9ae8f9f08d275b3750dcdc676f415b51dc
font_01_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 10608 bytes
SHA-256: 218f3f256b161695b5225af552669e12b6999fc75f612fc6b0ecfce0fc2b8614
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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